Grebe type RPDB crystal radio frequency detector
date: label: date made
content: 1920
name: label: maker
content: A. H. Grebe & Co.
notes: label: Description (Brief)
content: A glass enclosed crystal holder with crystal of unknown type installed, Adjustment knob for cat’s whisker and a contact screw on the plastic bottom plate, two binding posts on the top plate. Assembly is mounted on a base stamped: “A.H. Grebe & Co.” Reference: https://www.radiomuseum.org/r/grebe_rpdb_crystal_detector.html.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Paul G. Watson
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.325336
label: catalog number
content: 325336
label: accession number
content: 252994
objectType: label: Object Name
content: Detector, Crystal
label: Object Name
content: radio receiver
label: Object Name
content: crystal radio
label: Other Terms
content: Detector, Crystal; Components; Radio and Television; Radio and Television
physicalDescription: label: Measurements
content: overall: 2 3/4 in x 2 3/4 in x 2 1/4 in; 6.985 cm x 6.985 cm x 5.715 cm