|photography related industry in Rochester (New York)|
|American Camera | Bausch & Lomb | Blair | Century | Crown Optical Co. | Elgeet | Folmer & Schwing | Gassner and Marx | Graflex | Gundlach | Ilex | JML | Kodak | Milburn | Monroe | PMC | Ray | Reichenbach, Morey and Will | Rochester Camera and Supply Co. | Rochester Optical Co. | Seneca | Sunart | Walker | Wollensak|
|and in Rochester (Minnesota)|
| graflex.org - Rudolf Kingslake's|
"Optical industry in Rochester (N.Y.)"
Gassner and Marx was founded by Benjamin Marx, James Rothschild and Henry Gassner. They manufactured the Day Plate Camera on which they had received a patent in 1898. It had to be loaded with a set of 3¼ x 4¼-inch glass plates which were packaged in a strip of black paper, thus allowing daylight loading of the camera.