Spark gap for electrotherapy machine by Heller
Spark gap for electrotherapy machine by Heller, Germany, 1885-1920
- Object Number:
- A182715 Pt1
- type:
- spark gaps
Electrotherapeutic machine, wooden case, with metal fittings, by Heller,
Spark gap for electrotherapy machine by Heller, Germany, 1885-1920
Interrupters for electrotherapy machine, wood and brass, by Heller, Germany, 1885-1920