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"Everyone acquainted with the subject will recognize it as a conspicuous failure."
Henry Morton, president of the Stevens Institute of Technology ; Said in 1880 about the light bulb
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| Number | Title | Issue Date |
| 6298250 | Wireless prepaid telephone system with extended capability A telecommunication system incorporates individual station instruments simplified by wireless operation, voice dialing, prepaid accounting and out-call operation, all enabled by cooperative system operation including supporting central equipment. Wireless... | 10/02/2001 |
| 6149353 | Wireless prepaid telephone system with dispensable intruments A telecommunication system incorporates individual station instruments simplified by wireless operation, voice dialing, prepaid accounting and out-call operation, all enabled by cooperative system operation including supporting central equipment. Wireless... | 11/21/2000 |
| 6049710 | Wireless prepaid telephone system with dispensable instruments A telecommunication system incorporates individual station instruments simplified by wireless operation, voice dialing, prepaid accounting and out-call operation, all enabled by cooperative system operation including supporting central equipment. Wireless... | 04/11/2000 |
