EXHIBIT 6.4
December 2, 1999
Xx. Xxxxxx X. Xxxx
Chairman
Clinical Chemistry Holdings, Inc.
0000 Xxx Xxxxxxx
Xxxxxxx, XX 00000
Dear Xx. Xxxx:
The letter agreement between Xxxxxx Investment Strategies, Inc.
("Xxxxxx"), Clinical Chemistry Holdings, Inc. ("CCH"), and Xxxxxx X. Xxxx, dated
November 12, 1999, and amended by letters dated November 24, 1999 and November
26, 1999 ("Letter Agreement"), is modified and amended, effective as of November
26, 1999, by the deletion of the fourth numbered paragraph thereof and the
insertion of the following in its place:
4. Other than with respect to the continued beneficial ownership or
sale of shares of Common Stock of Novitron held by Xxxxxx and various
accounts over which Xxxxxx has dispositive power on the Effective Date
other than the Shares, Xxxxxx agrees that neither Xxxxxx nor any of its
affiliates will purchase, beneficially own or control any shares of
Common Stock of Novitron or otherwise trade in, or with respect to, the
Common Stock of Novitron for a period of two (2) years from the
Effective Date.
Except as modified and amended in this letter, the Letter Agreement
shall remain in full force and effect. If you are in agreement with the above,
please execute this amendment to the Letter Agreement and return a signed copy
to the undersigned at the address indicated above.
XXXXXX INVESTMENT STRATEGIES, INC.
By: /s/ Xxx Xxxxxx
----------------------------------
Xxx Xxxxxx, President
CLINICAL CHEMISTRY HOLDINGS, INC.
By: /s/ Xxxxxx X. Xxxx
-----------------------------------
Xxxxxx X. Xxxx, Chairman
Page 19 of 21 Pages
/s/ Xxxxxx X. Xxxx
---------------------------------
Xxxxxx X. Xxxx, Individually
Page 20 of 21 Pages
