Photoswitch Inc., electronic level controls, undated
name: label: Collection Creator
content: Instrument Society of America
setName: label: See more items in
content: Instrument Society of America Collection
label: See more items in
content: Instrument Society of America Collection / Series 3: Trade Literature
container: label: Container
content: Box 84, Folder 8
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials