Use of general-purpose incandescent lamps and of methods to extend their life in lights of all types which are normally operated with long-life incandescent lamps
DE3001755A1
Traffic signal bulb operation for enhanced life time - has bulb of specific rating operated at reduced voltage level to increase operational life by several orders of magnitude
DE2917189A1
Gravity doser for powders - esp to provide accurate dose of medicines fed into tablet making machines
ATA802078A
Abrasion resistant magnetic head
DE2805778A1
Magnetic head with screening housing - has bottom part, forming running surface for magnetic tape, with specified material film
DE2805777A1
Wear-resistant magnetic recording-playback heads - coated with plasma-deposited materials
DE2756834A1
Wear resistant magnetic recording head - where hard alloy is deposited on working surface of head
DE2641977A1
Alarm indicating presence of moving objects - uses passive radio reflection detection and has store of natural sounds to avoid activation by normal stimulation
DE2639102A1
Domestic burglar alarm system - uses electronic barrier and time switching unit with pre-alarm store and natural sound producing unit
GB1254043A
Multi-track erasing head
GB1243577A
Magnetic head
DE1165087B
Magnetic head
DE1166830B
Multi-track magnetic head with improved crosstalk attenuation
GB896271A
Improvements in magnetic sound recording means
DE1116421B
Arrangement for magnetic recording of frequency mixtures divided into frequency ranges
DE1166829B
Magnetic head
DE1047466B
Multi-track magnetic head with intermediate layers between the individual magnetic heads
GB830302A
Improvements in magnetic sound recording
DE1042912B
Arrangement for magnetic recording of sound and image pulses
