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Magnetic tape was available in a variety of models, all using open-reel ½ inch magnetic tape. Various models could read and write seven-track or nine-track tape with densities from 200 bits per inch (bpi) to 1600 bpi at rates of 37.5 inches per second (ips) to 150 ips.
Fail-safe locking devices are unlocked when de-energized. Direct pull electromagnetic locks are inherently fail-safe. Typically the electromagnet portion of the lock is attached to the door frame and a mating armature plate is attached to the door. The two components are in contact when the door is closed.
The door holders release, allowing the doors to close automatically using door closers. [1] [2] The electric power to keep the doors open is typically 12 VDC, 24 VDC (common), 24 VAC, 120 VAC, or 240 VAC. The closed doors may or may not mechanically latch or lock in the closed position.
Installing a wireless magnetic contact breaker on a door. The trigger signal from sensors are transmitted to one or more control units either through wires or wireless means, such as radio, line carrier, and infrared.
Honeywell, Groupe Bull, and Control Data Corporation formed a joint venture in Magnetic Peripherals Inc. which became a major player in the hard disk drive market. [ 12 ] : 124 Honeywell was the worldwide leader in 14-inch disk drive technology in the OEM marketplace in the 1970s and early 1980s, especially with its SMD (Storage Module Drive ...
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