phonocardiographphonographphonograph recordphononphosphorphosphor bronzephosphor dot faceplatephosphorescence afterglowphosphorogenphosphorusphotphoto etchingphoto excitationphoto island gridphotocathodephotocellphotochemical activityphotochromic compoumdphotochromic glassphotoconductive cell light dependent photo resistor resistor light sensitivephotoconductivityphotoconductorphotocurrentphotodarlingtonphotodetectorphotodetector light detector light sensitive cell liht sensitive detector photosensorphotodiodephotodiode parametric amplifierphotodissociationphotoelastic effectphotoelectieric effectphotoelectirc counterphotoelectiric edirectional counterphotoelectricphotoelectric absorptionphotoelectric autocollimtorphotoelectric cathodephotoelectric color register controlphotoelectric colorimeterphotoelectric constantphotoelectric controlphotoelectric currentphotoelectric cutoff register controllerphotoelectric densitometerphotoelectric emissionphotoelectric flame failure detectorphotoelectric intrusion detectorphotoelectric lighting controllerphotoelectric liquid level indicatorphotoelectric material
