Photo of vials in lab area; used for making faucets somehow; published in "The Story of Faucets" by Mueller Co.
Marked with stamp, 'Return to L.B. Spafford Domestic Engineering Electrical Department' on back.
Marked with inscription, 'Small piece of paper with photo printing instructions' on back.
|Title||Photo of vials in lab--used in The Story of Faucets|