Document:

Exhibit 10.4

 Exhibit 10.4 
 Renewal of Agreement with Cisco Systems, Inc. 
 On March 18, 2005, the Company was re-certified as a Cisco
Premier certified partner pursuant to an Indirect Channel Partner Agreement between the Company and Cisco Systems, Inc. The re-certification was effective through September 30, 2007. On March 2, 2007, the Company was notified
electronically that such certification had been renewed effective January 29, 2007 through March 26, 2008.Exhibit 10.5

 Exhibit 10.5 
 Renewal of Hewlett Packard Agreement 
 Pursuant to a Hewlett Packard US Business Development Partner Agreement, the
Company was appointed a Business Development Partner for the purchase and resale or sublicense of Hewlett Packard’s products, services and support. The agreement was originally effective until March 31, 2005 and was subsequently extended
until June 30, 2007. On November 8, 2007, the Company was notified electronically that the agreement had been renewed through May 31, 2009.Common Stock Certificate of Teradata Corporation

 Exhibit 4.1 
 

 
  
 CERTIFIED
SHAREHOLDER 
 Common Stock 
 No. __________ 
 TERADATA 
 Shares ___________ 
 This Certifies that ________________________________________ is the registered holder of fully-paid and non-assessable Shares of Common Stock of Teradata Corporation transferable only on the books of the Corporation by the holder
hereof in person or by Attorney upon surrender of this Certificate properly endorsed. This Certificate and the Shares represented hereby are subject to all the terms, conditions, and limitations of the Charter of the Corporation and all amendments
thereto and supplements thereof. 
 In Witness Whereof, the said Corporation has caused this Certificate to be signed by its
duly authorized officers and its Corporate Seal is to be affixed hereto. 
 President ______________________________

 Secretary ______________________________ 
 Date ___________________________________ 
 ISSUER: TERADATA CORP DEL

 CUSIP NUMBER: 88076W 103Letter Agreement

 Exhibit 10.108 
 REDACTED – OMITTED MATERIAL HAS BEEN SEPARATELY FILED WITH THE COMMISSION PURSUANT TO RULE 24b-2 OF THE 
 SECURITIES EXCHANGE ACT OF 1934, AS AMENDED, AND IS DENOTED HEREIN BY ***** 
  

			
	Robert S. Thomas	  	Cengiz Balkas
	President & CEO	  	Vice President, Materials
	Charles & Colvard, Ltd.	  	Cree, Inc.
	300 Perimeter Park, Suite A	  	4600 Silicon Drive
	Morrisville, NC 27560	  	Durham, NC 27703

 This letter, when signed on behalf of Charles & Colvard, Ltd. (“C&C”) and Cree, Inc.
(“Cree”), will serve as an agreement between C&C and Cree to provide the following terms effective on and after December 25, 2007, amending the parties’ December 25, 2006 letter agreement: 
  

	 	1.	Cree will supply Silicon Carbide (“SiC”) production crystals to C&C, and C&C will purchase SiC production crystals from Cree, according to the terms stated in this
letter agreement. 

  

	 	2.	C&C will purchase ***** kg each quarter of calendar 2008 of “usable material” (where “usable material” will be determined in the manner described in
Paragraph 3) at a price of $*****/gram. Provided that Cree uses its best commercially reasonable efforts to deliver the quantities of usable material required by this letter agreement, Cree will not be held in breach for delays in delivery. As used
in this letter agreement, “quarter” refers to fiscal quarters of Cree ending during the indicated period. 

  

	 	3.	The quantity of “usable material” of crystals delivered to C&C pursuant to this letter agreement will be determined according to the following:

  

	 	A.	Material will be graded according to the specifications in Attachment A. 

  

	 	B.	Grams of usable material will be calculated on a crystal-by-crystal basis according to the following equation: (usable mm) as a percent of total length of the crystal in mm
multiplied by the actual weight of the crystal in grams. “Usable mm” means millimeters of usable material as defined in Attachment A. 

  

	 	C.	Crystals shipped to C&C must contain at least ***** grams of usable material for the 2” crystals, ***** grams for 2.25” crystals, ***** grams for 2.40” crystals
or ***** grams for 3” crystals. This usable area must be contiguous. Crystal diameter to be shipped will be 2”, 2.25”, 2.40” or 3”, as determined by Cree. 

  

	 	4.	Except as expressly provided herein, the supply and purchase of SiC material will be governed by the terms and conditions of the parties’ Amended and Restated Exclusive Supply
Agreement dated June 6, 1997 (the “Supply Agreement”, as amended). 

  

	 	5.	The contents of this letter agreement shall be considered “Confidential Information” of each party subject to the provisions of Section 5 of the Supply Agreement.

	 	

	 	

 REDACTED – OMITTED MATERIAL HAS BEEN SEPARATELY FILED WITH THE COMMISSION PURSUANT TO RULE 24b-2 OF
THE 
 SECURITIES EXCHANGE ACT OF 1934, AS AMENDED, AND IS DENOTED HEREIN BY ***** 
  

									
	CHARLES & COLVARD, LTD.	 		 	CREE, INC.
					
	By:	 	 /s/ Robert S. Thomas
	 		 	By:	 	 /s/ Cengiz Balkas

		 	Robert S. Thomas	 		 		 	Cengiz Balkas
		 	President & CEO	 		 		 	Vice President & General Manager
	Date:	 	Nov. 12, 2007	 		 	Date:	 	Nov. 12, 2007

 REDACTED – OMITTED MATERIAL HAS BEEN SEPARATELY FILED WITH THE COMMISSION PURSUANT TO RULE 24b-2 OF
THE 
 SECURITIES EXCHANGE ACT OF 1934, AS AMENDED, AND IS DENOTED HEREIN BY ***** 
 ATTACHMENT A 
 Specification of usable material as referenced in paragraph 2 above.

 COLOR: Usable material is calculated as “light gray” or “very light
gray”. Specifically tone/color number 20 and 10 1 as used in the C&C boule-grading screen will be considered acceptable tone and color material.
(Note: Grade 10 is preferred. Grade 20 material will be valued at $***** per-gram.) 
 DEFECTS: 
 Material volume of acceptable color will be reduced by the percentage of the defects listed in the table below. C&C shall set the acceptable standards for the quality
of both the color and defects of all material purchased pursuant to this letter agreement. Unless otherwise mutually agreed by the parties in writing, however, the grading of the material by both Cree and C&C will adhere to those standards and
methods identified in Notes 1 & 2 below, applied on a consistent basis in the same manner as applied during September, October and November of calendar 2003. Should C&C deem such standards and methods or new defects unacceptable, it can
request changes to its volume commitment or the methods, standards or list of price reducing defects, with such changes to be effective sixty (60) days after giving Cree notice of the changes. Cree may request changes to its pricing and/or
volume commitment. If the parties do not agree in writing on the changes to be made, before the effective date of the requested changes, either party can terminate this letter agreement upon notice and, in that event, the Supply Agreement will
govern the parties’ obligations thereafter. 
  

					
	ID	  	 D-Type
	  	 
	1	  	*****	  	Reduce
	2	  	*****	  	Reduce
	3	  	*****	  	Reduce
	4	  	*****	  	No reduction
	5	  	*****	  	Reduce
	6	  	*****2	  	Reduce
	7	  	*****	  	No reduction
	8	  	*****	  	Reduce
	9	  	*****	  	Reduce

 Notes 

	1	CH0257R 17.4mm tone/color 20 (lightest 20), new gray boules that are lighter than this will grade as 10, CE0269R 9.5mm tone/color 30 (lightest 30), new gray boules that are
lighter than this will grade as 20 

	2	Micropipe grading will be performed according to the Cree document identified as the CCG – 948 Rev C, Dense Fine Pipe Grading procedure (Revision 8/17/06). The area determined
according to this procedure multiplied by 1.2, (“20% adder”), defines the area of non-usable material for micropipes.Restricted Stock Award Agreement of Phillip DeZwirek dated July 2, 2007

 Exhibit 10.1 
 RESTRICTED STOCK AWARD AGREEMENT 
 THIS RESTRICTED STOCK AWARD AGREEMENT (the
“Agreement”) is made and entered into as of July 2, 2007, by and between CECO Environmental Corp., a Delaware corporation (the “Company”), and Phillip DeZwirek (the “Participant”) relating to
the grant and issuance of shares of Common Stock of the Company under the CECO Environmental Corp. 2007 Equity Incentive Plan (the “Plan”). 
 Statement of Purpose 
 WHEREAS, the Company desires to grant to the Participant, and the Participant
accepts the grant of, 100,000 shares of Common Stock (the “Shares”); 
 WHEREAS, the Company has duly made all determinations
necessary or appropriate in connection with the grant of the Shares hereunder. 
 NOW, THEREFORE, in consideration of the premises and the
mutual covenants herein contained, the parties hereto hereby agree as follows: 
 1. Definitions. Unless otherwise defined
herein, capitalized terms in this Agreement shall have the same meaning as defined in the Plan. 
 2. Grant, Vesting and Settlement of
Restricted Shares 
 (a) Grant. As of July 2, 2007, the Company hereby grants and issues to the Participant, and the
Participant hereby accepts the grant of the Shares in such number as is specified in attached Exhibit A. Concurrent with the execution and delivery of the Agreement, the Company will cause the stock certificates representing the Shares to be issued
in Participant’s name. To the extent the Participant hereby acquires the Shares and the Shares are not fully vested as of the date hereof, such Shares shall constitute “Restricted Shares” and shall be subject to all of the
restrictions described herein. Stock certificates representing Restricted Shares shall be held by the Company until such time as the Shares vest. 
 (b) Vesting and Settlement. The Restricted Shares shall cease to constitute Restricted Shares, and shall become unrestricted Shares, pursuant to the vesting schedule attached as Exhibit A. 
 3. Restriction on Transfer; Legend. Restricted Shares or any interest therein may not be directly or indirectly sold, transferred, pledged,
hypothecated, or otherwise disposed of. The Restricted Share certificates shall bear the following legend: 
 The shares represented by this
certificate are subject to restrictions on transfer and may not be sold, exchanged, transferred, pledged, hypothecated or otherwise disposed of except in accordance with and subject to all of the terms and conditions of a Restricted Stock Award
Agreement dated as of July 2, 2007, a copy of which the Company shall furnish to the holder of this certificate upon request and without charge. 

 When the restrictions on any Shares lapse, the Corporation shall cause a replacement stock certificate
for those Shares, without the legend referred to above, to be issued and delivered to Participant as soon as practicable. 
 4. Tax
Consequences. The Company shall not be liable or responsible in any way for any and all tax (including any withholding tax) consequences relating to the Shares, and the Participant agrees to undertake to determine, and be responsible for,
any and all tax (including any withholding tax) consequences to himself or herself with respect to the Shares. Notwithstanding any other provision of this Agreement, the Shares, shall not be released to the Participant unless, the Participant shall
have paid to the Company, or made arrangements satisfactory to the Company regarding the payment of, any Federal, state, local or foreign taxes of any kind required by law to be withheld with respect to the grant of the Shares or the lapse of
restrictions otherwise imposed by this Agreement. 
 5. Section 83(b) Election. The Participant understands that
Section 83 of the Code may tax as compensation income the difference between the amount paid for the Restricted Shares, if any, and the fair market value of the Restricted Shares as of the date any restrictions on the Restricted Shares lapse in
the absence of an election under Section 83(b) of the Code. In this context, “restriction” means the forfeitability of the Restricted Shares pursuant to the terms of this Agreement. In the event the Common Shares are registered under
the Securities Exchange Act of 1934, as amended (the “Exchange Act”), “restriction” with respect to the officers, directors, and 10% stockholders may also mean the six-month period after the acquisition of the Restricted Shares
during which sales of certain securities by such officers, directors, and ten percent (10%) stockholders would give rise to liability under Section 16(b) of the Exchange Act. The Participant understands that he may elect to be taxed at the
time the Participant receives the Restricted Shares and while the Restricted Shares are subjected to restrictions rather than waiting to be taxed on the Restricted Shares when and as the restrictions lapse. The Participant realizes that he may
choose this tax treatment by filing an election under Section 83(b) of the Code with the Internal Revenue Service within thirty (30) days from the date hereof and by filing a copy of such election with his tax return for the tax year in
which the Restricted Shares were subjected to the restrictions. The participant acknowledges that it is the participant’s sole responsibility and not the Company’s to timely file the election under Section 83(b) of the code. The
participant acknowledges that he shall consult his own tax advisers regarding the advisability or non-advisability of making the election under Section 83(b) of the code and acknowledges that he shall not rely on the company or its advisers for
such advice. 
 6. Voting. Participant shall have the rights and privileges of a stockholder of the Company as to the Shares,
including the right to receive dividends and the right to vote such Shares. 
 7. No Employment Rights. No provision of this
Agreement shall give the Participant any right to continue in the employ of the Company, create any inference as to the length or term of Participant’s employment, affect the right of the Company to terminate Participant’s employment, with
or without cause, or give the Participant any right to participate in any employee welfare or benefit plan or other program of the Company. 
  

 2 

 8. Termination. This Agreement shall only be terminated, modified or amended upon written
mutual agreement of the Company and the Participant. 
 9. Notices. Any notice given hereunder must be in writing and shall be
deemed given when either personally delivered or placed in the United States mail by registered or certified mail, return receipt requested, postage prepaid, addressed to the parties to whom such notice is being given at the following addresses:

  

	 	As to the Company:	CECO Environmental Corp. 

	 	    	3120 Forrer Street 

	 	    	Cincinnati, OH 45209 

	 	    	Attn: Chief Financial Officer 

  

	 	As to Participant:	last address shown on the books of the Company 

 10.
Remedies. Each of the parties to this Agreement will be entitled to enforce its rights under this Agreement specifically, to recover damages by reason of any breach of any provisions of this Agreement and to exercise all other rights
existing in its favor. Participant agrees and acknowledges that money damages will not be an adequate remedy for any breach of the provisions of this Agreement and the Company shall be entitled to specific performance and/or injunctive relief in
order to enforce or prevent any violations of the provisions of this Agreement. 
 11. Gifts. Nothing contained in this
Agreement shall be construed or interpreted so as to authorize or permit Participant to transfer the Restricted Shares by gift to any person or entity. 
 12. Entire Agreement. The Plan and this Agreement contains the entire understanding and agreement by and between the parties hereto relating to the subject matter hereof and all prior or contemporaneous
oral or written agreements or instruments are superseded hereby. No amendment to or modification of this Agreement shall be effective unless the same is in writing and signed by all parties hereto. No waiver by any party of any breach by the other
of any provision of this Agreement shall be deemed to be a waiver of any other breaches thereof or the waiver of any such or other provision of this Agreement. Subject to the restrictions on assignment and transfer set forth hereinabove, this
Agreement shall be binding upon and inure to the benefit of the parties hereto, their estates, personal representatives, successors and assigns. 
 13. Severability. If any provision of this Agreement is declared invalid or unenforceable as a matter of law, such invalidity or unenforceability shall not affect or impair the validity or enforceability of any other
provisions of this Agreement or the remainder of this Agreement as a whole. 
  

 3 

 14. Applicable Law. If any question arises at any time as to the validity, construction,
interpretation or performance of this Agreement the laws of the State of Delaware shall govern and control. The parties hereto hereby acknowledge that venue is proper in Hamilton County, Ohio. 
 15. Construction. Paragraph headings and subheadings have been inserted herein for convenience only and shall not be deemed to have any
legal effect whatever in the interpretation of this Agreement. As used herein, the singular shall include the plural and the plural and singular. The word “any” means one or more or all, and the conjunction “or” includes both the
conjunctive and disjunctive. 
 16. Execution. This Agreement may be executed in multiple originals, each of which shall be
deemed to be an original hereof. 
 IN WITNESS WHEREOF, the Company and Participant have caused the execution of this Agreement under seal as
of the date hereof, each intending to be legally bound hereby 
  

			
	CECO ENVIRONMENTAL CORP.
		
	By:	 	/s/ Dennis W. Blazer
	Its:	 	/s/ CFO
	
	/s/ Phillip DeZwirek
	Phillip DeZwirek

  

 4 

 CECO Environmental Corporation Restricted Stock Award Agreement 
 Phillip DeZwirek 
 Vesting of
Restricted Stock 
  

	1.	Number of Restricted Shares 

 The number of
Shares granted under the Agreement shall be a total of 100,000 Restricted Shares. 
  

	2.	Vesting of Restricted Shares 

 (a) Subject to
Subsection (b) below, 100,000 Restricted Shares shall become earned and vested according to the following schedule: 
  

			
	 Portion of 100,000 Restricted Shares
       that Become Vested and Earned
	  	Vesting Date
	 1/3
	  	July 2, 2008
	 1/3
	  	July 2, 2009
	 1/3
	  	July 2, 2010

 (b) Notwithstanding anything to the contrary in this Section 2, if Participant no longer is
either an officer or director of the Company as of any of the above vesting date(s), then Participant shall have no further rights with respect to such unvested Restricted Shares, except that (i) if Participant’s termination as an officer
and/or director is due to death or Disability, then the Compensation Committee may in its sole discretion cause any unvested Restricted Shares to vest. In addition, upon the occurrence of Change in Control, the Board may in its sole discretion cause
any unvested Restricted Shares to vest. 
  

 5

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