William F. Semple, a dentist, was awarded the first US Patent on chewing gum in 1869. His recipe contained powdered chalk.
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| Number | Title | Issue Date |
| 7313323 | Camera system with a photometering device and an external operating device A camera system includes a camera body including a photometering device and an external operating device, and a photographing lens which is detachably attached to the camera body, the photographing lens including an aperture setting device for selecting an auto aper... | 12/25/2007 |
| 6450561 | Attachment devices Attachment devices (10) may include a base portion (22) comprising a base body (25) and an upper flat surface (25a). A holder portion (21) may extend from a first end of a first arched attachment part (31) and may include a base plate (24) having an upper... | 09/17/2002 |
| 4469426 | Camera of automatic exposure control type A camera of the automatic exposure control type includes a protective cover which is movable between a closed position where it covers a taking lens and a photometric assembly and an open position where it permits them to be uncovered completely. The came... | 09/04/1984 |
| 4280760 | Flash camera A flash camera having features that an aperture control is made in accordance with the factors whether a film sensitivity is high or low and besides whether a flash apparatus is used, that a constant-voltage circuit of small power consumption is employed ... | 07/28/1981 |
| 3984847 | Electric eye exposure apparatus for use in a camera having a bladed shutter mechanism An electric eye exposure apparatus includes an exposure meter interlocked with drive means and a switching mechanism for selectively connecting the drive means either to a shutter blade operating mechanism or to a diaphragm aperture control mechanism. The... | 10/05/1976 |
| 3968503 | Shutter for photographic cameras with a flash equipment A flash emitter is automatically actuated upon releasing the shutter when the brightness of an object to be photographed is below a predetermined level. Upon the flashwise photographing, the diaphragm aperture is also automatically controlled in accordanc... | 07/06/1976 |