Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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| Number | Title | Issue Date |
| 7803027 | Watercraft paddle propulsion system A watercraft propulsion device having a plurality of cooperating paddles driven by levers in a sweeping motion while cooperating with a peddle gear and electric motor in order to produce a reciprocating back and forth paddle motion capable of driving the watercraft ... | 09/28/2010 |
| 4913669 | Boat propulsion apparatus A boat propulsion apparatus having a thrust blade mounted for swinging movement about a generally horizontal swing axis lengthwise of the boat and for turning movement about an upright blade axis, and a swash plate drive for simultaneously swinging the bl... | 04/03/1990 |
| 4496325 | Collapsible paddle boat A paddle boat comprising a plurality of floats, collapsible driving and propelling apparatus, folding steering apparatus, the driving and propelling apparatus and steering apparatus adapted for mounting onto the floats during use of the paddle boat, parti... | 01/29/1985 |
| 4353703 | Nautical propulsion device A pedal-operated nautical propulsion device for small craft, such as a pneumatic raft. The device comprises a pedal crank system producing circular motion which is transmitted by a frame-supported mechanism to a holder carrying a paddle to cause the paddl... | 10/12/1982 |
