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Kellogg T-32 +- Late 1920
US Army Signal Corps
Philips 695A +- 1936 / 1937
Micro Braun BMB 2025 f +- 1933
RCA 'Bullet' MI-12017 +- 1938
Tube Tester Signal Corps I-177 +- 1953
Military Tube Tester TV-7 D/U
Mende L54 +- 1931
Mende 169W +- 1931 / 1932
Tube Tester Knight KG-600B +- 1964
