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Flame grooves: Three spiral grooves along the body to vent gases and aid in fuze ignition
The data plate shows Signal Corps U
Atlas Instrument Co
By the 1840s
This attractive grouping features a variety of Deutsches Reich issues from the 1930s and 1940s
WWII U.S. Army I-56 Tube Tester Set by Weston Hoodies Flame grooves: Three spiral groovesWWII U. S. Army I 56 Tube Tester Set by Weston Original U. S. Army Signal Corps Test Set I 56 manufactured by Weston Electrical Instrument Corporation during World War II. Complete portable vacuum tube testing kit housed in its original transit case with tester, adapters, charts, operating instructions, and tube test data sheets. Used by military radio and radar technicians for testing and diagnosing vacuum tubes in field communications equipment.
