Efficient photographic flash
EL operating power supply circuit
Electric circuit arrangement
Electric device comprising at least one low-pressure mercury vap
Electric flash apparatus
Electric flash apparatus
Electric flash apparatus
Electric flash device
Electric flash device for camera
Electric flash device with printed coil transformer
Electric flash discharge device
Electric spark type light source for producing light for spectro
Electrical circuit for the pulsed operation of high-pressure gas
Electrical power supplies
Electromagnetic pulse device
Electronic ballast for fluorescent lamp
Electronic ballast for fluorescent lamps
Electronic ballast for gas discharge lamp
Electronic ballast for gas discharge lamp having primary and aux
Electronic ballast for operating lamps in parallel