Webster Signature Database - Suggest Correction

Signature Maker Instruments Comments Location References
HASSLER, IZAAC USA, 1848, OIM manufactured all kinds of optical glass. Philadelphia, Pa. USNM.

E-mail address:
Explain your correction here:
To protect against spam entries,
please type the sum of 5 and 2 into this box
(i.e. the number between 6 and 8):