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  2. Battery holder - Wikipedia

    en.wikipedia.org/wiki/Battery_holder

    By the 1920s, battery holders used twin metal clips (like fuse holders) to hold the battery in place while making electrical contact. Patent no. 1439429 was granted in Dec. 1922 for an assembly with two spring arm clips, a small switch, and a lamp assembly on the end of connected wires.

  3. Mamiya C330 - Wikipedia

    en.wikipedia.org/wiki/Mamiya_C330

    This model was 340 grams lighter than the previous model C33, which weighed 2040 grams (with 80 mm lens). The later C330f is an improvement on the C330 and was succeeded by the C330S with further improvements. Uses 120 and 220 rollfilms; With the rack and pinion bellows type focusing system, close-up photography is possible without attachments.

  4. 555 timer IC - Wikipedia

    en.wikipedia.org/wiki/555_timer_IC

    In 1972, Signetics originally released the 555 timer in DIP-8 and TO5-8 metal can packages, and the 556 timer was released in a DIP-14 package. [ 4 ] In 2006, the dual 556 timer was available in through-hole packages as DIP-14 (2.54 mm pitch), [ 21 ] and surface-mount packages as SO-14 (1.27 mm pitch) and SSOP-14 (0.65 mm pitch).

  5. Lockheed C-130 Hercules - Wikipedia

    en.wikipedia.org/wiki/Lockheed_C-130_Hercules

    Boeing's design completed over 2,000 hours of wind tunnel tests in late 2009. It was a 5 percent-scale model of a narrow body design with a 55,000 lb (25,000 kg) payload. When the AFRL increased the payload requirement to 65,000 lb (29,000 kg), they tested a 5 percent-scale model of a widebody design with a 303,000 lb (137,000 kg) take-off ...