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A keystone module is a standardized snap-in package for mounting a variety of low-voltage electrical jacks or optical connectors into a keystone wall plate, face plate, surface-mount box, or a patch panel. Keystone modules have a rectangular face of 14.5 mm wide by 16.0 mm high and are held in place with flexible tabs.
A MIL-DTL-38999 circular connector plated with a nickel–teflon composite. Left: plug (male) type connector; Right: receptacle (female) type connector) Electrical or fiber-optic connectors used by U.S. Department of Defense were originally developed in the 1930s for severe aeronautical and tactical service applications, and the Type "AN" series set the standard for modern military circular ...
The keystone (shown in red) of an arch Dropped keystone at Colditz Castle. A keystone (or capstone) is the wedge-shaped stone at the apex of a masonry arch or typically round-shaped one at the apex of a vault. In both cases it is the final piece placed during construction and locks all the stones into position, allowing the arch or vault to ...
The D575A-3SD measures 16 feet 0 inches (4.88 m) tall, 38 feet 5 inches (11.71 m) long has a ground clearance of 2 feet 5 inches (0.74 m). [2] The D575A-3SD features a Super Dozer blade designed to dump, dig or carry that measures 11 feet 11 inches (3.63 m) high and 24 feet 3 inches (7.39 m) wide. It has a capacity of 90yd3 (69m3).
Designed as LB-10 with 575 hp (429 kW) Pratt & Whitney GR-1860 engines; three ordered, but redesigned with 525 hp (392 kW) Wright R-1750-3 engines and delivered as the Y1B-5. Y1B-5 Three pre-production aircraft redesignated from LB-14 before delivery. B-5A Wright R-1750-3 version originally ordered as B-3A, 27 built
Experimental low-speed research aircraft with highly-swept wings in support of F23/49 (i.e. English Electric P.1) Short SB.5 [57] M.101 NA.28 1950, 1952 Three-seat anti-submarine aircraft Fairey Firefly AS.7 [58] N102 1950 Two-seat trainer for Royal Navy Boulton Paul Sea Balliol [59] ER.103 1950 Delta-wing research aircraft capable of Mach 1.5
The Keystone entry was for an all metal low winged monoplane bomber with retractable landing gear. The bomber would be powered by two Curtiss V-1570 geared Conqueror engines. With a crew of 5 it was armed with up to 3 x .30 caliber machine guns and could carry 2,000 lbs (907 kg) of bombs on external racks.
Keystone B-6 airmail plane in snowstorm, 1934 The B-6A together with B-5A were front line bombers of the United States for the period between 1930 and 1934. Afterwards, they remained in service primarily as observation aircraft until the early 1940s.