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 |
| 4542998 | Character set printing means utilizing rolling pressure contact for printing A printing apparatus is provided which utilizes rolling pressure contact for printing, and includes a plurality of sets of serially arranged character elements mounted for movement on the external surface of a printing drum. Movement of the sets to place ... | 09/24/1985 |
| 4005650 | Print hammer The impact tip of the print hammer is provided with a curved face in one direction and shaped in a cylindrically-arcuate configuration. The impact tip is formed with the surface curvature in a direction perpendicular to the direction of character height a... | 02/01/1977 |
| 3954054 | Squeeze printer for papers or stacks of papers of varying thicknesses A squeeze printer for papers or stacks of papers of varying thicknesses wherein a plurality of printing platens are provided comprising individual flexible wall sections of a paper supporting chute which will accommodate different thicknesses of paper or ... | 05/04/1976 |
