Document:

INTERCORE ENERGY, INC.

(F/K/A HEARTLAND BRIDGE CAPITAL,
INC.)

PROMISSORY NOTE

 

Principal Amount: $600,000May
21, 2012

 

FOR VALUE RECEIVED,
InterCore Energy, Inc., a Delaware corporation, its assigns and successors (the “Company”), hereby promises to pay
to the order of Epec Biofuels Holdings, Inc., a Florida corporation, (the “Holder”), in immediately available funds,
the total principal sum of Six Hundred Thousand Dollars ($600,000). The principal hereof shall be due and payable on or before
5:00 p.m., Eastern Daylight Time, on July 31, 2012 (the “Maturity Date”) (unless such payment date is accelerated
as provided in Section 5 hereof). Payment of all amounts due hereunder shall be made at the address of the Holder provided for
in Section 8 hereof. There shall be no interest rate attached to this Note.

 

1.             HISTORY
OF THE LOAN. This Note is being delivered to Holder as consideration under that certain Common Stock Purchase Agreement
by and between the Company and Holder, dated of even date hereof (the “Stock Purchase Agreement”).

 

2.            PAYMENT
SCHEDULE. The principal due under this Note will be due and payable by the Company to the Holder on the following schedule:
$150,000 due on or before each of June 15, 2012, June 30, 2012, July 15, 2012, and July 31, 2012 (each an “Installment Payment”).

 

3.            PREPAYMENT.
The Company may at any time prepay all or any part of the principal balance of this Note, at a prepayment price equal to One Hundred
Percent (100%) of the then-outstanding principal.

 

4.            TRANSFERABILITY.
This Note shall not be transferred, pledged, hypothecated, or assigned by either Party without the express written consent of the
other Party. In the event any third party acquires a controlling interest in the Company or acquires substantially all of the assets
of the Company (a “Reorganization Event”), this Note will survive and become an obligation of the party that acquires
such controlling interest or assets. In the event of a Reorganization Event the Company agrees to make the party that acquires
such controlling interest or assets aware of the terms of this Section and this Note and of its obligations hereunder.

 

5.            DEFAULT.
The occurrence of any one of the following events shall constitute an Event of Default:

 

(a)          The
non-payment, when due, of any principal or Installment Payment pursuant to terms of this Note;

 

(b)          The
material breach of any representation or warranty in this Note. In the event the Holder becomes aware of a breach of this Section
5(b), the Holder shall notify the Company in writing of such breach and the Company shall have five business days after notice
to cure such breach;

 

    	A

    	 

    

 

(c)          The
breach of any covenant or undertaking, not otherwise provided for in this Section 5;

 

(d)          The
commencement by the Company of any voluntary proceeding under any bankruptcy, reorganization, arrangement, insolvency, readjustment
of debt, receivership, dissolution, or liquidation law or statute of any jurisdiction, whether now or hereafter in effect; or the
adjudication of the Company as insolvent or bankrupt by a decree of a court of competent jurisdiction; or the petition or application
by the Company for, acquiescence in, or consent by the Company to, the appointment of any receiver or trustee for the Company or
for all or a substantial part of the property of the Company; or the assignment by the Company for the benefit of creditors; or
the written admission of the Company of its inability to pay its debts as they mature; or

 

(e)          The
commencement against the Company of any proceeding relating to the Company under any bankruptcy, reorganization, arrangement, insolvency,
adjustment of debt, receivership, dissolution, or liquidation law or statute of any jurisdiction, whether now or hereafter in effect,
provided, however, that the commencement of such a proceeding shall not constitute an Event of Default unless the Company consents
to the same or admits in writing the material allegations of same, or said proceeding shall remain undismissed for 20 days; or
the issuance of any order, judgment or decree for the appointment of a receiver or trustee for the Company or for all or a substantial
part of the property of the Company, which order, judgment or decree remains undismissed for 20 days; or a warrant of attachment,
execution, or similar process shall be issued against any substantial part of the property of the Company.

 

Upon the occurrence
of any Default or Event of Default, the Holder may, by written notice to the Company, declare all or any portion of the unpaid
principal amount due to Holder immediately due and payable, in which event it shall immediately be and become due and payable,
provided that upon the occurrence of an Event of Default as set forth in paragraph (d) or paragraph (e) hereof, all or any portion
of the unpaid principal amount due to Holder shall immediately become due and payable without any such notice.

 

Upon the occurrence
of any Default or Event of Default, the Company agrees to pay, all reasonable costs of collection, including reasonable attorneys'
fees and costs.

 

The Company hereby waives presentment for
payment, notice of non-payment, demands of any kind, protest and notice of protest, notice of dishonor, and diligence in the collection
of this Note and in filing suit hereon and in filing suit to enforce any security or collateral given for the payment hereof. The
Company hereby waives any right of offset and any defenses in any action for collection hereon, except for the defense of payment.
The Holder or any other holder hereof shall not be liable for failure to collect or lack of diligence in bringing suit on this
Note or any renewal or extension hereof or upon or with respect to any security given for the payment hereof or for failure to
diligently bring suit to enforce any security instrument or lien given as security for the payment hereof or for failure to make
demand or presentment for payment or to protest or give notice of protest, dishonor, or nonpayment or any other notice, or generally
for any act of omission or commission.

 

    	A

    	 

    

 

6.          NOTICES.
All notices required or permitted hereunder shall be given as set forth in the Stock Purchase Agreement.

 

7.          GOVERNING
LAW; VENUE. This Note is executed pursuant to and shall be interpreted and governed for all purposes under the laws of
the State of Texas. Any cause of action brought to enforce any provision of this Note shall be brought in the appropriate court
in Fort Bend County, Texas. If any provision of this Agreement is declared void, such provision shall be deemed severed from this
Note, which shall otherwise remain in full force and effect. This Note shall supersede any previous agreements, written or oral,
expressed or implied, between the parties relating to the subject matter hereof. 

 

8.          CONFORMITY
WITH LAW. It is the intention of the Company and Holder to conform strictly to applicable usury and similar laws. Accordingly,
notwithstanding anything to the contrary in this Note, it is agreed that the aggregate of all charges which constitute interest
under applicable usury and similar laws that are contracted for, chargeable or receivable under or in respect of this Note, shall
under no circumstances exceed the maximum amount of interest permitted by such laws, and any excess, whether occasioned by acceleration
or maturity of this Note or otherwise, shall be canceled automatically, and if theretofore paid, shall be either refunded to the
Company or credited on the principal amount of this Note.

 

9.          MODIFICATION;
WAIVER. No modification or waiver of any provision of this Note or consent to departure therefrom shall be effective unless
in writing and approved by the Company and Holder. If any provision of this Note shall be invalid or
unenforceable in any jurisdiction, such invalidity or unenforceability shall not affect the validity or enforceability of the remainder
of this Note or the validity or enforceability of this Note in any other jurisdiction. This Note supersedes all prior agreements
and understandings among the parties hereto with respect to the subject matter hereof.

 

IN WITNESS WHEREOF,
the Company has signed and sealed this Note and delivered it as date written above.

 

	“Company”	 	“Holder”
	 	 	 
	InterCore Energy, Inc.,	 	Epec Biofuels Holdings, Inc.,
	a Delaware corporation	 	a Florida corporation
	 	 	 
	 	 	 
	By:	James F. Groelinger	 	By:	Steven Vanechanos
	 	 	 	 	 
	Its:	Chief Executive Officer	 	Its:	Executive Chairman

 

    	AExhibit 4.3

 

	Number *0*	Shares *0*

 

	 	SEE REVERSE FOR IMPORTANT NOTICE
	 	ON TRANSFER RESTRICTIONS AND OTHER INFORMATION

 

	 	THIS CERTIFICATE IS TRANSFERABLE	 	CUSIP____________
	 	IN THE CITIES OF_______________	 	 

 

MONMOUTH REAL ESTATE INVESTMENT CORPORATION

a Corporation Formed Under the Laws of the
State of Maryland

 

THIS CERTIFIES THAT
**Specimen** is the owner of **Zero (0)** fully paid and nonassessable shares of _____% Series B Cumulative Redeemable Preferred
Stock, $0.01 par value per share, of

 

Monmouth Real Estate Investment Corporation

 

(the “Corporation”) transferable
on the books of the Corporation by the holder hereof in person or by its duly authorized attorney, upon surrender of this Certificate
properly endorsed. This Certificate and the shares represented hereby are issued and shall be held subject to all of the provisions
of the charter of the Corporation (the “Charter”) and the Bylaws of the Corporation and any amendments or supplements
thereto. This Certificate is not valid unless countersigned and registered by the Transfer Agent and Registrar.

 

IN WITNESS WHEREOF,
the Corporation has caused this Certificate to be executed on its behalf by its duly authorized officers.

 

DATED: __________________

 

	Countersigned and Registered:	 	 
	Transfer Agent	 	_________________________________(SEAL)
	and Registrar	 	Chief Executive Officer

 

	By: ______________________________	 	_______________________________________
	Authorized Signature	 	Secretary

 

    	 

    	 

    

 

IMPORTANT NOTICE

 

The Corporation will furnish to any stockholder,
on request and without charge, a full statement of the information required by Section 2-211(b) of the Corporations and Associations
Article of the Annotated Code of Maryland with respect to the designations and any preferences, conversion and other rights, voting
powers, restrictions, limitations as to dividends and other distributions, qualifications, and terms and conditions of redemption
of the stock of each class which the Corporation has authority to issue and, if the Corporation is authorized to issue any preferred
or special class in series, (i) the differences in the relative rights and preferences between the shares of each series to the
extent set, and (ii) the authority of the Board of Directors to set such rights and preferences of subsequent series. The foregoing
summary does not purport to be complete and is subject to and qualified in its entirety by reference to the Charter, a copy of
which will be sent without charge to each stockholder who so requests. Such request must be made to the Secretary of the Corporation
at its principal office.

 

The securities represented by this Certificate
are subject to restrictions on ownership and Transfer for the purpose of the Corporation’s maintenance of its status as a
“Real Estate Investment Trust” under the Internal Revenue Code of 1986, as amended. Except as otherwise provided pursuant
to the Charter of the Corporation, no Person may Beneficially Own or Constructively Own Equity Stock in excess of 9.8% (in value
or in number of shares of Equity Stock, whichever is more restrictive) of the outstanding Equity Stock of the Corporation, with
further restrictions and exceptions set forth in the Charter of the Corporation. There may be no Transfer that would cause a violation
of the Ownership Limit, that would result in Equity Stock of the Corporation being Beneficially Owned by fewer than 100 Persons,
that would result in the Corporation’s being “closely held” under Section 856(h) of the Code, or that would otherwise
result in the Corporation failing to qualify as a REIT. Any Person who attempts or proposes to own, Beneficially Own or Constructively
Own Equity Stock in excess of, or in violation of, the above limitations must notify the Corporation in writing at least 15 days
prior to such proposed or attempted Transfer to such Person. If an attempt is made to violate these restrictions on Transfers,
(i) any Purported Transfer will be void and will not be recognized by the Corporation, (ii) the Corporation will have the right
to redeem the Stock proposed to be Transferred, and (iii) the Stock represented hereby generally will be automatically converted
into and exchanged for Excess Stock, which will be held in trust by the Trustee in part for the benefit of a Charitable Beneficiary.
All capitalized terms in this legend have the meanings defined in the Charter of the Corporation, a copy of which, including the
restrictions on ownership and Transfer, will be sent without charge to each stockholder who directs a request for such information
to the Chairman of the Board of the Corporation.

 

KEEP THIS CERTIFICATE IN A SAFE PLACE. IF
IT IS LOST, STOLEN OR DESTROYED, THE CORPORATION
 WILL REQUIRE A BOND OF INDEMNITY AS

A CONDITION TO THE ISSUANCE OF A REPLACEMENT
CERTIFICATE.

 

The following abbreviations, when used in
the inscription on the face of this Certificate, shall be construed as though they were written out in full according to applicable
laws or regulations:

 

	TEN COM	-	as tenants in common	 	UNIF GIFT MIN ACT _____________	Custodian _________
	TEN ENT	-	as tenants by the entireties	 	(Custodian)	(Minor)
	JT TEN	-	as joint tenants with right of survivorship and not as tenants in common	 	Under the Uniform Gifts to Minors Act of  _______________
	 	 		 	(State)

 

	FOR VALUE RECEIVED, _______________ HEREBY SELLS, ASSIGNS AND TRANSFERS UNTO	 
	 	(PRINT OR TYPE NAME & ADDRESS, INCLUDING ZIP CODE & SS# OR OTHER
	 	IDENTIFYING NUMBER, OF ASSIGNEE)

 

____________(____________)
shares of stock of the Corporation represented by this Certificate and does hereby irrevocably constitute and appoint

 

______________________attorney to transfer the said shares on
the books of the Corporation, with full power of substitution in the premises.

 

Dated: _______________________

 

	 	 
	 	NOTICE:  THE SIGNATURE TO THIS ASSIGNMENT
    MUST CORRESPOND WITH THE NAME AS WRITTEN UPON THE FACE OF THE CERTIFICATE IN EVERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT
    OR ANY OTHER CHANGE.

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