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This is a trapped-key interlock on the door of an electrical switchgear cabinet. It is attached with one-way security screws to discourage casual removal, which would defeat the interlock scheme. Trapped-key interlocking utilizes locks and keys for sequential control of equipment and machinery to ensure safe operation. Trapped-key interlocks ...
The key will not turn unless the remaining keys are put back in place. Trapped key interlock transfer block. Another example is an electric kiln. To prevent access to the inside of an electric kiln, a trapped key system may be used to interlock a disconnecting switch and the kiln door. While the switch is turned on, the key is held by the ...
Groundframe, with the two rightmost levers locked by Annett's key. In British, Australian, French, and Swiss railway signalling, an Annett's key is a form of trapped-key interlocking that locks levers or other items of signalling apparatus, thereby serving as a portable form of interlocking.
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Two B-29's (45-21871 and 45-21761), one B-17 Flying Fortress, and one long-range OA-10A Catalina reconnaissance aircraft were launched. Also available was an Air Transport Command C-74 Globemaster, which was at Ladd in temporary status from Morrison Field, Florida, performing cold-weather testing.
He ordered everyone in the fortress to stay under cover while he hid behind the walls, creating an illusion of an empty fortress. As Wen Ping expected, Sun Quan became suspicious and he said to his subordinates, "The northerners regard this man (Wen Ping) as a loyal subject, which is why they entrusted him with defending this commandery.
Vardøhus Fortress (Norwegian: Vardøhus festning), called "Wardhouse" in English historical navigations, is located in Vardø Municipality in Finnmark county, Norway. It is located in the town of Vardø on the island of Vardøya on the Barents Sea near the mouth of the Varangerfjord in northeastern Norway near the Russian border.
Portcullis at Desmond Castle, Adare, County Limerick, Ireland The inner portcullis of the Torre dell'Elefante in Cagliari, Sardinia, Italy A portcullis (from Old French porte coleice 'sliding gate') is a heavy, vertically closing gate typically found in medieval fortifications. [1]