Radio tubes and valves, thermionic detector and amplifier tubes and valves; oscillator tubes; rectifier tubes; ballast and gaseous glow discharge tubes; Photoelectric cells; photolytic cells, loudspeakers, electric pickups, radio amplifying units, electronic tubes, tube sockets, tuning units; resistance units, capacity units, wet and dry batteries,reactance and frequency controls, tuning devices; flashers for head lamps of automobiles, combined headlamp bulbs and signal devices, radio receiving and transmitting sets; television receiving and transmitting sets; talking machines, radio receiving sets combined with electrically operated talking machines,