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"Everyone acquainted with the subject will recognize it as a conspicuous failure."
Henry Morton, president of the Stevens Institute of Technology ; Said in 1880 about the light bulb
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| Number | Title | Issue Date |
| 5993287 | Children's play structure A children's play structure includes a frame having hinging structures capable of being arranged into a free-standing structure and at least one interchangeable panel capable of removable attachment to the frame. The frame is easily assembled and is folda... | 11/30/1999 |
| 5881789 | Childrens play structure A children's play structure includes a frame having hinge structures that enable the structure to be arranged into a free-standing structure having a variety of adjustable positions. Interchangeable panels can be provided for removable attachment to the s... | 03/16/1999 |
| 5352149 | Children's play structure with interchangeable scene A children's play structure includes a frame having hinging sections capable of being arranged into a free-standing structure and interchangeable panels capable of removable attachment to the frame to provide multiple scenes on the plurality of hinging se... | 10/04/1994 |
