Document:

<PAGE>

                                   EXHIBIT 4.3

                    AMENDMENT TO THE BY-LAWS OF HARDINGE INC.

                             DATED FEBRUARY 20, 2001

          Effective February 20, 2001, the first sentence of Article III,
Section 3. of the By-Laws of Hardinge Inc. was amended to read:

          "THE NUMBER OF DIRECTORS CONSTITUTING THE ENTIRE BOARD SHALL BE TEN
(10)."<PAGE>

                                                                    EXHIBIT 10.3

                              AMENDMENT NUMBER ONE

          This Amendment Number One is dated as of December 11, 2000 and is to
the Credit Agreement among the Hardinge Inc., the Bank's signatory thereto and
The Chase Manhattan Bank as Agent, dated August 1, 1997 (the Agreement). Terms
used but not otherwise defined herein shall have the meanings ascribed thereto
in the AGREEMENT.

          In order the amend the Agreement, the parties agree as follows:

          1.    Section 1.01 of the Agreement shall be amended by adding the
following definitions:

                Acquisition Agreement means the Stock Purchase Agreement by and
                between Ziersch Beteiligungs GmbH as seller, HTT Hauser Tripet
                Tschudin AG, and Hardinge Inc, as purchaser, with respect to the
                sale and purchase of all of the issued and outstanding shares of
                stock of HTT Hauser Tripet Tschudin AG.

                Acquisition Date means the date the Acquisition Agreement has
                been signed by all parties thereto.

          2.    The definition of "Margin" as set forth in Section 1.01 of the
Agreement shall be amended effective as of the Acquisition Date to read as
follows:

                "Margin" means for each Variable Rate Loan zero (0) Basis Points
                and for each Eurodollar Loan seventy-five (75) Basis Points.

          3.    The definition of Reference Banks as set forth in Section 1.01
of the Agreement shall be amended in its entirety to read as follows:

                "Reference Banks" means The Chase Manhattan Bank and Fleet
                National Bank, and their respective successors.

          4.    Article 6 of the Agreement shall be amended by adding Section
6.10 as follows:

                Section 6.10 ACQUISITION AGREEMENT. Provide the Agent with a
                true copy of the signed Acquisition Agreement within three (3)
                days of the Acquisition Date.

<PAGE>

          5.    Section 2.11 (a) of the Agreement shall be amended in its
entirety to read as follows:

                (a) The Borrower shall pay to the Agent for the account of each
                Bank a commitment fee on the daily average unused Commitment of
                such Bank for the period from and including August 1, 1997 to
                the earlier of the date the Commitments are terminated or the
                day prior to the Acquisition Date, at a rate per annum equal to
                fifteen (15) Basis Points if the ratio of Total Funded Debt to
                Earnings Before Interest, Taxes, Depreciation and Amortization
                is equal to or less than 1.0 to 1.0, twenty (20) Basis Points if
                the ratio Funded Debt to Earnings Before Interest, Taxes,
                Depreciation and Amortization is greater than 1.0 to 1 and less
                than or equal to 2.0 to 1.0, and twenty-five (25) Basis Points
                if the ratio Funded Debt to Earnings Before Interest, Taxes,
                Depreciation and Amortization is greater than 2.0 to 1.0. The
                Borrower shall pay to the Agent for the account of each Bank a
                Commitment Fee on a daily average unused Commitment of such Bank
                for the period from and including the Acquisition Date to the
                earlier of the date the Commitments are terminated or the
                Termination Date at a rate per annum equal to twenty-five (25)
                Basis Points. The accrued commitment fee shall be due and
                payable in arrears upon any reduction or termination of the
                Commitments and on each Quarterly Date, and shall be calculated
                on the basis of a year of 360 days for the actual number of days
                elapsed. Where required, computation shall be based upon
                Borrower's financial statements for the immediately preceding
                four (4) fiscal quarters for income statement items and the most
                recent fiscal quarter for balance sheet items.

          6.    Section 7.01(h) of the Agreement shall be amended by adding the
following at the end thereof:

                Notwithstanding the foregoing, and subject to and upon the
                closing of the transaction governed by the Acquisition
                Agreement, (i) the amount of Liens against property other than
                inventory and receivables shall not exceed Thirteen Million
                Dollars ($13,000,000.00) in the aggregate and (ii) Liens against
                the receivables of HTT Hauser Tripet Tschudin AG shall be
                permitted.

          7.    The last paragraph of Section 7.05 of the Agreement shall be
amended in its entirety to read as follows;

                                      -2-

<PAGE>

                Notwithstanding the foregoing, the aggregate amount of
                acquisitions (net of amounts paid for with the Borrower's stock)
                permitted under this section without the prior written consent
                of the Required Banks shall not be greater than Fifteen Million
                Dollars ($15,000,000.00) in any consecutive twenty-four (24)
                month period, except that for the twenty-four (24) month period
                next following the Acquisition Date the amount shall be the
                lower of Thirty-six Million Dollars ($36,000,000.00) or the
                amount paid as provided under the Acquisition Agreement.

          8.    Section 7.07 of the Agreement shall be amended by adding the
following at the end thereof:

                Notwithstanding the foregoing, the Borrower shall be permitted
                during the period commencing on the closing of the transaction
                covered by the Acquisition Agreement and continuing for ninety
                (90) calendar days thereafter to lend to L. Kellenberger & Co.,
                AG, or other wholly owned Subsidiary, up to Thirty-six Million
                Dollars ($36,000,000.00) for the sole purpose of purchasing all
                the issued and outstanding shares of stock of HTT Hauser Tripet
                Tschudin AG and the retirement of shareholder debt. Any Loans
                made to the Borrower for purposes of funding such loan shall be
                repaid within ninety (90) days of the date made.

          9.    This Amendment Number One may be executed in any number of
counterparts, all of which taken together shall constitute one and the same
instrument, and any patties hereto may execute this Amendment Number One by
signing such counterpart.

          10.   Other than as set forth in this Amendment Number One, the terms
and conditions of the Agreement shall remain in full force and effect.

                IN WITNESS WHEREOF, THE PARTIES HERETO have caused this
Amendment Number One to be executed by their duly authorized officers as of the
day and year first above written.

                                               HARDINGE INC.

                                               By: /s/ Robert E. Agan
                                                  ------------------------------
                                                  Robert E. Agan, Chairman of
                                                  the Board and Chief Executive
                                                  Officer

                                      -3-
<PAGE>

                                               AGENT:

                                               THE CHASE MANHATTAN BANK,

                                               By: /s/ Christine M. McLeod
                                                  ------------------------------
                                                  Christine M. McLeod,
                                                  Vice President

                                      -4-
<PAGE>

                                               BANKS:

                                               THE CHASE MANHATTAN BANK,

                                               By: /s/ Christine M. McLeod
                                                  ------------------------------
                                                  Christine M. McLeod,
                                                  Vice President

                                               FLEET NATIONAL BANK
                                               Successor to Fleet Bank

                                               By: /s/ Joanna Teasdale
                                                  ------------------------------
                                                  Joanna Teasdale,
                                                  Vice President

                                               MANUFACTURERS & TRADERS TRUST
                                               COMPANY

                                               By: /s/ Peter Newman
                                                  ------------------------------
                                                  Peter Newman, Vice President<PAGE>

                                                                    EXHIBIT 10.6

                              AMENDMENT NUMBER TWO

          This Amendment Number Two is dated as of December 11. 2000 and is to
the Credit Agreement among Hardinge Inc., the Bank's signatory thereto and The
Chase Manhattan Bank (National Association) (now The Chase Manhattan Bank) as
Agent, dated as of February 28, 1996 and amended as of August 1, 1997 (as
amended the Agreement). Terms used but not otherwise defined herein shall have
the meanings ascribed thereto in the Agreement.

          In order to further amend the Agreement, the parties agree as follows:

          1.    Section 1.01 of the Agreement shall be amended by adding the
following definitions:

                Acquisition Agreement means the Stock Purchase Agreement by and
                among Ziersch Beteiligungs GmbH as seller, HTT Hauser Tripet
                Tschudin AG, and Hardinge Inc. as purchaser, with respect to the
                sale and purchase of all of the issued and outstanding shares of
                stock of HTT Hauser Tripet Tschudin AG.

                Acquisition Date means the date the Acquisition Agreement has
                been signed by all parties thereto.

          2.    The definition of Margin as set forth in Section 1.01 of the
Agreement shall be amended effective as of the Acquisition Date to read as
follows:

                Margin means for each Variable Rate Loan zero (0) Basis Points
                and for each Eurodollar Loan seventy-five (75) Basis Points.

          3.    The definition of Reference Banks as set forth in Section 1.01
of the Agreement shall be amended in its entirety to read as follows:

                Reference Banks means The Chase Manhattan Bank and HSBC Bank
                USA, and their respective successors.

          4.    Article 6 of the Agreement shall be amended by adding Section
6.10 as follows:

                Section 6.10 ACQUISITION AGREEMENT. Provide the Agent with a
                true copy of the signed Acquisition Agreement within three (3)
                days of the Acquisition Date.

<PAGE>

          5.    Section 7.01(h) of the Agreement shall be amended by adding the
following at the end thereof:

                Notwithstanding the foregoing. and subject to and upon the
                closing of the transaction governed by the Acquisition
                Agreement, (i) the amount of Liens against property other than
                inventory and receivables shall not exceed Thirteen Million
                Dollars ($13,000.000.00) in the aggregate, and (ii) Liens
                against the receivables of HTT Hauser Tripet Tschudin AG shall
                be permitted.

          6.    The last paragraph of Section 7.05 of the Agreement shall be
amended to read as follows:

                Notwithstanding the foregoing. the aggregate amount of
                acquisition (net of amounts paid for with the Borrower's stock)
                permitted under this section without the prior written consent
                of the Required Banks shall be not greater than Fifteen Million
                Dollars ($15,000,000.00) in any consecutive twenty-four (24)
                month period. except that for the twenty-four (24) months next
                following the Acquisition Date the amount shall be the lower of
                Thirty-six Million Dollars ($36,000,000.00) or the amount paid
                as provided under the Acquisition Agreement.

          7.    Section 7.07 of the Agreement shall be amended by adding the
following at the end of that Section:

                Notwithstanding the foregoing, the Borrower shall be permitted
                during the period commencing on the closing of the transaction
                covered by the Acquisition Agreement and continuing for ninety
                (90) calendar days thereafter, to lend to L. Kcllenberger & Co.,
                AG, or other wholly owned Subsidiary, up to Thirty-six Million
                Dollars ($36,000,000.00) for the sole purpose of purchasing all
                of the issued and outstanding shares of stock of HTT Hauser
                Tripet Tschudin AG and the retirement of shareholder debt.

          8.    This Amendment Number Two may be executed in any number of
counterparts, all of which taken together shall constitute one and the same
instrument, and any parties hereto may execute this Amendment Number Two by
signing any such counterpart.

          9.    Other than as set forth in this Amendment Number Two, the terms
and conditions of the Agreement shall remain in full force and effect.

                                       2
<PAGE>

          IN WITNESS WHEREOF, the parties have caused this Amendment Number Two
to be executed by their duly authorized officers as of the day and year first
above written.

                                               HARDINGE INC.

                                               By: /s/ Robert E. Agan
                                                  ------------------------------
                                                  Robert E. Agan, Chairman of
                                                  the Board and Chief Executive
                                                  Officer

                                               AGENT:

                                               THE CHASE MANHATTAN BANK
                                               Successor to The Chase Manhattan
                                               Bank (National Association)

                                               By: /s/ Christine M. McLeod
                                                  ------------------------------
                                                  Christine M. McLeod,
                                                  Vice President

                                       3
<PAGE>

                                               BANKS:

                                               THE CHASE MANHATTAN BANK,
                                               Successor to The Chase Manhattan
                                               Bank (National Association)

                                               By: /s/ Christine M. McLeod
                                                  ------------------------------
                                                  Christine M. McLeod,
                                                  Vice President

                                               THE CHASE MANHATTAN BANK
                                               f/k/a Chemical Bank

                                               By: /s/ Christine M. McLeod
                                                  ------------------------------
                                                  Christine M. McLeod,
                                                  Vice President

                                               HSBC BANK USA
                                               f/k/a Marine Midland Bank

                                               By: /s/ Ronald W. Lesch
                                                  ------------------------------
                                               Name:  Ronald W. Lesch
                                                    ----------------------------
                                               Title:  V.P.
                                                     ---------------------------

                                       4

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