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 |
| 4856921 | Rotary wheel printer A rotary wheel printer such as a daisy wheel printer comprises a rotatable platen for winding a print paper sheet partially therearound, a carriage movable along the platen, a type wheel mounted on the carriage in confronting relation to the platen and ha... | 08/15/1989 |
| 4653944 | Character selecting mechanism for a serial printer A serial printer of the print thimble type is provided with a character selecting mechanism tied in with the ribbon advance mechanism. A drive gear is rotationally rigid with the print thimble and is driven to rotate by a gear of greater thickness than th... | 03/31/1987 |
| 4427312 | Printwheel detent A printwheel 20 for a daisy wheel printer 10, the printwheel 20 including a hub portion 23 and a plurality of radially extending, deflectable petals 21 projecting therefrom. The petals include a pad or tip 24 thereon with print forming indicia on one surf... | 01/24/1984 |
| 4244290 | Miniature printer A miniature printer includes character rings, each having a series of characters on the outer periphery thereof and teeth on a side surface thereof for selection of a character to be printed. The shaft carrying the character rings also has mounted thereon... | 01/13/1981 |
| 4127064 | Large type rotary printer A large type printer which continuously drives annular printing wheels having circumferentially spaced printing facets on their peripheries. The driving mechanism is a friction drive which may be overriden. Thus, the apparatus includes means for monitorin... | 11/28/1978 |
| 4008794 | Type carrier print deflection blocking means for a single-element printer A single-element type carrier printing mechanism is provided with an element movable to block tangential deflection of the type carrier at printing impact with the platen, is normally disengaged from frictional contact with the type carrier during rotatio... | 02/22/1977 |
| 3963109 | Single element typehead positioning mechanism A non-homing positioning mechanism to effect type selective movements of a single element typehead by means of coordinate band systems wherein the coordinate band systems are cntrolled by a translator comprising a four armed cross-shaped member unidirecti... | 06/15/1976 |
| 3957149 | Selector system for a type-bearing element of an office machine A selector system for a type-bearing element of a typewriter, accounting machine or other office machines, wherein a positioning member for the type-bearing element is positioned positively by a series of cam followers movable by a corresponding series of... | 05/18/1976 |
