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In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.
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| Number | Title | Issue Date |
| 4919553 | Printer having head release mechanism responsive to space commanding codes A printer wherein a print head is movable by a head release mechanism, between a printing position and a release position, and a print ribbon is fed only when the print head is in the printing position. The printer has a space commanding member such as a ... | 04/24/1990 |
| 4587663 | Conversation device with space and feed movement related to actuation time of control key The invention provides a conversation device having a space key for instructing feeding of a printing tape without printing, a pulse oscillator for producing pulses of predetermined period upon depression of the space key, a counter for counting the pulse... | 05/06/1986 |
| 4343557 | Spacebar touch control apparatus A typewriter space bar touch control apparatus comprises a bell crank member, mounted on a support frame, which supports the space bar and a lever member which engages the bell crank when the space bar is depressed more than a small initial displacement. ... | 08/10/1982 |
