Signedtag on top of Eastman box on the bottom left hand side says Claude Gelotte Inc/ 1290 Mass. Ave, Harvard Square Cambridge, M.A./ Camera Exchange Photo Supply
ELC in large capital letters in pencil on the top of upper left-hand box
Inscribedon the top of Eastman box [bottom left ]: received January 13, 1941
on the top of Cramer's box [bottom center]: April 17, 1939
on the top of Wratten and Wainwright box [top right]: star spectra Jeff lab
on the top of Eastman box [bottom left]: Sept 1937
FunctionPhotographic plates preceded photographic film. A light sensitive emulsion of silver salts was was applied to a glass plate for the function of film development.