Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 4026373 | Hill plower A pedestrian controlled tractor particularly suitable for use in working farmland where the ground surface is rough and hilly. The tractor in its preferred form has a relatively narrow endless track driving means and is provided with tubular members direc... | 05/31/1977 |
