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PHOTOELECTRIC CELLS, KITS OF PHOTOELECTRIC CELLS, KITS OF PHOTOELCTRIC CELLS AND OTHER ELECTRIC COMPONENTS, PARTS OF PHOTOELECTRIC CELLS, ELECTRIC CIRCUITS CONTAINING PHOTOELECTRIC CELLS, PHOTOELECTRIC CELLS OF THE PHOTOCONDUCTIVE TYYPE AND APRTS THEREOF, KITS OF PHOTOELECTRIC CELLS OF THE PHOTOCONDUCTIVE TYPE AND PARTS THEREOF, AND ELECTRIC CIRCUITS CONTAINING PHOTOELECTRIC CELLS OF THE PHOTOCONDUCTIVE TYPE AND PARTS THEREOF, AND KITS CONTAINING PHOTOELECTRIC CELLS OF THE PHOTOCONDDUCTIVE TYYPE TOGETHER WITH OTHER ELECTRIC CIRCUUIT COMPONENTS