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| Picture No | 10218219 |
| Date | 1928 |
| Description | Burglar alarm designs 1928 |
| Details |
Burglar detection by invisible beams. Once the beam is broken a alarm bell rings and a lamp lights up. The invisible rays ran across windows or doors to prevent entry.
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| Source | Illustrated London News. 1928 |
| Credit | © Illustrated London News Ltd/Mary Evans |
| Restrictions |
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