In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.
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| Application No. | Application Title | Issue Date |
| 20100061867 | Electromagnetic Transducer Apparatus An electromagnetic transducer apparatus (10) includes a core (30, 31) providing a pair of yokes (34, 35) between which there is an air gap (38, 39), at least one coil (32) disposed about the core (30, 31), an armature (14... | 03/11/2010 |