Cardioid dark ground condenser with centring mount, in woven box, by Tiyoda, Japanese, 1958-1962 Cardioid dark ground condenser with centring mount 1958-1962
Super-Wide cardioid condenser, for ultra violet light, with centring mount, in wooden box, by Tiyoda, Japan, 1958-1962 Super-Wide cardioid condenser 1958-1962