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LA-4A
{Phonautograph}
A1
Frequenzvariabler
A2
Transmitter
B1
Dialup
B2
Blitzlicht
B3
Semantron
C1
Resistor
C2
Piezophon
D1
Capacitance
D2
610
A1
Frequenzvariabler
A2
Transmitter
B1
Dialup
B2
Blitzlicht
B3
Semantron
C1
Resistor
C2
Piezophon
D1
Capacitance
D2
610