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 |
| 5568688 | Hair shaving device with curved razor blade strip A manually operated, finger-manipulatable non-electric hair trimming device is provided for shaving nostril hair, ear hair or the like. The hair trimming device includes a head structure sized to fit within a small body cavity, such as a person's nostril ... | 10/29/1996 |
| 5551153 | Razor blade assembly A twin-blade assembly is formed from two blade steel members (A, B) shaped to have rear mounting legs (3A/B), spring arms (9A, 9B) at opposite ends of the unit, downturned legs (2A, 2B) for reinforcing the members and sharpened blade edges (1A, 1B) on bla... | 09/03/1996 |
| 5517760 | Movable blade shaving cartridge or the like A spacer for maintaining separation between a first and a second blade in a razor blade cartridge, both the first and second blades having a forward cutting edge. The spacer includes a member forming an upper and lower surface having a plurality of holes ... | 05/21/1996 |
| 4603477 | Safety razors In a safety razor having cutting edges directed towards each other across a gap, i.e. an opposed blade razor, the blade edges are each formed with undulating edges. The blade margins are preferably corrugated and the corrugations intersected by planar fac... | 08/05/1986 |
| 4409735 | Safety razor A razor blade assembly which is flexible in at least one bending mode. A seat member of substantially planar shape has an integrally formed guard located transversely along its forward margin. The guard and seat members are formed of a flexible material. ... | 10/18/1983 |
| 4059891 | Blade and improved holder for it A holder for a razor blade is provided comprising a pair of spaced limbs having opposed internal surfaces defining an elongate seat which in use receives a strip blade, the seat having a depth less than the depth of a blade to be used so that the cutting ... | 11/29/1977 |