Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7354214 | Image forming apparatus having a chassis containing a curved part that supports a roller bearing The image forming apparatus includes a chassis, a feed roller, and a press roller. The chassis includes first and side surfaces, a bottom surface that connects the first and second side surfaces, and a curved part formed unitarily with the bottom surface. The curved... | 04/08/2008 |
| 5379691 | Screen printing frame assembly with screen anchors A screen frame assembly for mounting a printing screen includes a rectangular screen frame proper having a rectangular opening, and screen anchor members removably secured to frame anchor members along the four sides of the frame opening and having bondin... | 01/10/1995 |
| 5277721 | Method for making microporous marking structures A method for preparing a microporous ink-impregnated marking structure according to the invention involves use of a window-like frame instead of a conventional chase. The frame is placed on the upper face of the matrix board or mold so that the premix, co... | 01/11/1994 |
| 4181075 | Bumper-press printing device This invention relates to an improvement in printing devices whereby type may be set and bumper stickers and other items printed with an increase in speed and convenience on equipment of inexpensive design by providing a system of slots which line up meta... | 01/01/1980 |
