An Efficiency Meter for Electric Incandescent Lamps Department of Commerce & Labor
name: label: Collection Creator
content: Hammer, William J. (William Joseph), 1858-1934 (electrical engineer)
setName: label: See more items in
content: William J. Hammer Collection
label: See more items in
content: William J. Hammer Collection / Series 3: Reference Materials / 3.4: Incandescent Lighting Material / Pamphlets: A - D
unitdate: label: Date
content: 1906
container: label: Container
content: Box 46, Folder 3
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials