Bausch & Lomb Optical Co. (Rochester, NY)

 

Aluminum Iris Diaphragm Shutter - c. 1900

 

Notes: This 1891 patent Iris Diaphragm Shutter has a serial no. 5082.

References:
Illustrated Catalogue of Photographic Equipments and Materials for Amateurs, E. & H.T. Anthony & Co. (New York, NY), December, 1895, p. 77
 

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