Spark Gaps - O.C. Roos Notebook
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 32: Spark Gaps
unitdate: label: Date
content: 1910
container: label: Container
content: Box 185, Folder 5
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials