Photo-negative Engraving
date: label: Date made
content: November 25, 1879
name: label: maker
content: Bachman, Mortimer H.
label: maker
content: Peckenpaugh, S. S.
setName: label: See more items in
content: Work and Industry: Photographic History
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PG.000879
objectType: label: Object Name
content: Patent Model, Photo-negative Engraving