Series 40, FREQUENCY-CONTROL APPARATUS AND SYSTEMS
name: label: Collection Creator
content: Clark, George Howard, 1881-1956
setName: label: See more items in
content: George H. Clark Radioana Collection
label: See more items in
content: George H. Clark Radioana Collection / Series I: Miscellaneous Series
unitdate: label: Date
content: 1931
container: label: Container
content: Box 503, Folder 1
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials