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Thomas Edison obtained a patent for an electrographic vote recorder.
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| Number | Title | Issue Date |
| 4647024 | Frictional shock-absorbing method and apparatus This invention teaches an improved high capacity frictional shock-absorbing assembly. The assembly comprises a housing with a first threaded member which is fitted therein for axial movement. A second threaded member is rotatably-fitted in the housing, bu... | 03/03/1987 |
