High frequency sliding inductance on wood base, 1900-1950
1900-1950
Aerial tuning inductance, 1900-1950
1900-1950
Low frequency iron core inductance, 1900-1950
1900-1950
High-frequency chokes, 1900-1950
1900-1950
Aerial inductances, 1901
1901
Inductor tube
Inductor tube
Inductor tube
Brooks variable self and mutual inductor 90691
