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| door-bell; mechanical doorbell (Antique mechanically operated shop doorbell. | Although the first doorbells were mechanical, activated by pulling a cord, modern doorbells are electric – they are actuated by an electric switch. A precursor to the electric doorbell, specifically a bell that could be rung at a distance via an electric wire was invented by Joseph Henry around 1831. WK Alexander Demidov) | |||
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| дверной колокольчик: 1 phrase in 1 subject |
| Security systems | 1 |
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