"It is my heart-warmed and world-embracing Christmas hope and aspiration that all of us, the high, the low, the rich, the poor, the admired, the despised, the loved, the hated, the civilized, the savage (every man and brother of us all throughout the whole earth), may eventually be gathered together in a heaven of everlasting rest and peace and bliss, except the inventor of the telephone. "
Mark Twain ; Christmas greetings, 1890
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| Number | Title | Issue Date |
| 7220184 | Adjustable seesaw A seesaw includes a manually rotatable actuator for adjusting the balance of the seesaw to accommodate a weight differential between two riders. After adjusting the seesaw, the actuator automatically locks the adjustment mechanism in place. A rack-and-pinion assembl... | 05/22/2007 |
| 7070190 | Extendable and angularly adjustable handle for wheeled luggage A wheeled luggage case that is tilted for towing is provided with a retractable and, optionally, telescoping handle (4) assembly that is withdrawn from the interior of the case to an extended vertical position at the intersection of the top and rear walls, fr... | 07/04/2006 |
| 7005757 | Pneumatic human power conversion system based on children's play When large numbers of children play in a playground, part of the power of their play could be usefully harnessed resulting in large energy storage. This stored energy can then be converted for basic, low-power, applications in the school such as lighting, communicat... | 02/28/2006 |
| 6712709 | Teeter-totter A playground apparatus having at least one support base for stabilizing the apparatus. A plurality of pockets are formed within the support base. The playground apparatus also includes at least one side member disposed within the pockets. A plurality of fasteners se... | 03/30/2004 |
| 5951406 | Adjustable see-saw apparatus The seesaw device is adjustable as to the lengths of the moment arms on the beam, of the two seats. Children can adjust the moment-arm length of their own seat in order to compensate for weight imbalances between them. A visible display scale informs of t... | 09/14/1999 |
| 5522773 | Two person rocker with pivoting seats A rocking device for use as a toy incorporating several safety features to prevent the device from tipping over and the riders from falling off their seats or otherwise sustaining injuries during use. The rocking device includes a pair of substantially pa... | 06/04/1996 |