SHOWCASE 9. CELL 9-22

• BC-15A - Airplane radio telegraph spark-gap transmitter (USA, 1918)... more >>

• J-7-A - Flameproof straight key of US Signal Corps... more >>

• KTK 81 - German wide band monitoring crystal set... more >>

• EH 141 - Specialized receiver for monitoring sets... more >>

• SBUZ 1914 - US Signal Corps field telegraph... more >>

• VT-1 - The very first vacuum tube of US Signal Corps nomenclature (1917)... more >>

• VT-2 - Another early US Signal Corps vacuum tube (1917)... more >>

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