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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.
The D575A-2 SR Super Ripper was the first production version of the D575A, going into production beginning in 1991. It produced 1,050hp (784kw). The D575A-2 SR Super Ripper included a single shank ripper capable of digging to a maximum depth of 6 feet 9 inches (2.06 m). [4] The D575A-2 SR Super Ripper was superseded by the D575A-3.
The Keystone B-5 is a light bomber made by the Keystone Aircraft company for the United States Army Air Corps in the early 1930s. The B-5A was a Keystone B-3A with Wright Cyclone rather than Pratt & Whitney engines.
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 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.
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
Design of this class was based on rebuilds by Henry Fowler of the Midland Railway 2441 Class introduced in 1899 by Samuel Waite Johnson.These rebuilds featured a Belpaire firebox and improved cab. 422 Jinties were built between 1924 and 1931; this class was just one of the Midland designs used on an ongoing basis by the LMS.
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.