cpitcher@verizon.net:
SR-74 Spark Transmitter 1915 (3)
cpitcher@verizon.net:
SR-74 Spark Transmitter 1915 (2)
cpitcher@verizon.net:
WW-! Field Radio Desk Spark Gap
cpitcher@verizon.net:
Spark Gap Coils
cpitcher@verizon.net:
Clapp Eastham Spark Gap Key Bakelite Base
cpitcher@verizon.net:
Spark Gap Key SE 68A (military WW-I)
cpitcher@verizon.net:
Electro-Set Spark Gap Key
cpitcher@verizon.net:
Clapp Eastham Spark Gap Key Marble Base
cpitcher@verizon.net:
Bunnell Spark Gap Key Marble Base
cpitcher@verizon.net:
Spark Key Clapp Eastham "Boston Key"
cpitcher@verizon.net:
Spark Gap Transmitter in Action
cpitcher@verizon.net:
Spark Coil and Gap Murdock
cpitcher@verizon.net:
Murdock Spark Gap Oscillation Coil
cpitcher@verizon.net:
Fischer Spark Gap 1 KW Radio
cpitcher@verizon.net:
Rotary Spark Gap 1910
cpitcher@verizon.net:
Quenched Spark Gap Amrad
cpitcher@verizon.net:
Spark Gap Key (Unknown)
cpitcher@verizon.net:
Rotary Spark Gap Young & McCombs
cpitcher@verizon.net:
Radio Spark Gap (Unknown)
cpitcher@verizon.net:
Murdock Spark Gap
cpitcher@verizon.net:
Bunnell Vertical Spark Gap
cpitcher@verizon.net:
Loose Coupler Crystal Radio Receiver
cpitcher@verizon.net:
Radio Spark Gap Coils
cpitcher@verizon.net:
Spark Gap Transmitter Adj Oscillation Coil
cpitcher@verizon.net:
Mesco Spark Gap
cpitcher@verizon.net:
Bunnell Spark Gap Standard Wireless Keys
cpitcher@verizon.net:
Spark Coils for Spark Gap Transmitters
cpitcher@verizon.net:
Young & McCombs Rotary Spark Gap
cpitcher@verizon.net:
Navy Type Loose Coupler Crystal Receiver (Perkins)
cpitcher@verizon.net:
Bunnell Spark Gap Key
