Pair of HF generating coils, European, 1860-1910 Pair of HF generating coils, European, 1860-1910 1860-1910
Resistor coil for a small motor, insulated copper wire wound round cylindrical metal core, with handle, mounted on wooden base, A. Gaiffe, Paris, maker, French, 1880-1920 Resistor coil for a small motor 1880-1920
Resistor for use with electrocardiograph machine, 1934 Resistor for use with electrocardiograph machine 1934