"The wireless music box has no imaginable commercial value. Who would pay for a message sent to nobody in particular?"
David Sarnoff, American radio pioneer ; 1921
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| Number | Title | Issue Date |
| 6874800 | Hospital bed wheel linkage apparatus A patient support including a linkage assembly providing communication between at least one front wheel and at least one rear wheel. ... | 04/05/2005 |
| 3938607 | Vehicle steering apparatus A vehicle steering apparatus for a vehicle which has an endless track guided around front and rear rolls. When executing turns substantially larger than the minimum radius of turning of the vehicle, at least the front roll together with the front end of t... | 02/17/1976 |