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Image
|
Source
|
Observations
from the source
|
|
|
Gallenkamp (1930s)
|
Single
contact press key
|
|
|
Gallenkamp (1930s)
|
Electrometer
key
|
|
|
Gallenkamp (1930s)
|
Morse
key
|
|
|
Gallenkamp (1930s)
|
Morse
key
|
|
|
Gallenkamp (1930s)
|
Morse
key
|
|
|
Gallenkamp (1930s)
|
Battery
knife switch
|
|
|
Gallenkamp (1930s)
|
Spring
knife switch
|
|
|
Gallenkamp (c. 1939)
|
ELECTROMETER
KEY,
|
|
|
Gallenkamp (c. 1939)
|
BATTERY
SWITCH, with substantial copper parts.
|
|
|
Gallenkamp (c. 1939)
|
SINGLE
TAPPING KEY
|
|
|
