photo-electric valve photoelectric voltage photoelectrochemical cell photoelectromotive force photoelectron photoelement photoemission photoemissive photoemissive cell photoemissive effect photoemitter photoemulsion photo engraving photofabrication photofission photoflash photoflash lamp photoflash tube photoflood lamp photogeology |
photo-electric valve електровакуумен фотоелемент фотоклетка Търсената дума е намерена |