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"Transmission of documents via telephone wires is possible in principle, but the apparatus required is so expensive that it will never become a practical proposition."
Dennis Gabor, British physicist
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| Number | Title | Issue Date |
| 5196828 | Bendable currency security dye pack A security dye pack disguised as a bundle of currency for deterring robberies includes a housing formed from a stack of currency bills sewn together and having a hallow chamber formed therein. A substrate disposed within the chamber has a flexible central... | 03/23/1993 |
| 4522146 | Burglar alarm system incorporating pneumatically operated components Presented is a burglar alarm system for installation in residential, commercial or industrial premises. The burglar alarm system incorporates photographic equipment which photographs the intruder and a pneumatically operated audible alarm.... | 06/11/1985 |
