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The two dials are ganged so that they focus together and they can be focused by turning either dial. [1] The right lens focus dial is marked with distances 4, 5, 6, 8, 10, 15, 25, 50, INF. [ 1 ] Behind this dial is an arrow pointing at the point of focus and red marks showing the range of sharp focus for 3.5, 5.6, (red dot) and 8. [ 1 ]
For this telephone Western Electric produced a new type of subscriber sets, the No. 684A, which featured the same more compact form factor of the type No. 584, previously. When the 202 was introduced in mid-1931, [ 19 ] the U.S. economy was still in deep recession, and installations of new equipment was generally delayed until conditions improved.
like II but with slow speeds on frontal dial * Leica 250: 1933–1946: Leica III or IIIa with 250-image magazines (10 metres of film) Leica G (Leica IIIa) 1935–1940: adds 1/1000 speed: Leica IIIb: 1938–1940: Rangefinder and view windows closer together: Leica IIIc: 1940–1951: die-cast body, slightly longer, redesigned shutter featuring ...
A 220 Trimline rotary desk phone, showing the innovative rotary dial with moving fingerstop Early Touch Tone Trimline with round buttons and clear plastic backplate and round non-modular handset cord Redesigned touch-tone desk model Trimline, manufactured on January 9, 1985 The Trimline 2225, one of the last phones made at the Indianapolis Works in 1986 Early foreign made Trimline, December ...
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A push-button telephone is a telephone that has buttons or keys for dialing a telephone number, in contrast to a rotary dial used in earlier telephones.. Western Electric experimented as early as 1941 with methods of using mechanically activated reeds to produce two tones for each of the ten digits and by the late 1940s such technology was field-tested in a No. 5 Crossbar switching system in ...
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