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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 names of the aircraft shown in the table are not necessarily those they carried when provided for evaluation as at this point an aircraft would usually be referred to as the Manufacturer X.XX/XX, e.g., the Avro B.35/46 – this is in addition to the manufacturer's own separate internal designation for the aircraft, e.g., Avro 698.
In 1928, it merged with Loening and was known as Keystone–Loening. [2] In 1929, it was taken over by Curtiss-Wright . Also in 1929, the Keystone–Loening plant on the East River in New York City was closed by Curtiss-Wright and the operation was moved to the Bristol, Pennsylvania.
On April 28, 1931, the army ordered 25 improved Y1B-4s as the Keystone B-4A. This production version was part of the last biplane bomber order made by the Army Air Corps (along with 39 B-6As, identical in all respects except their make of engine), and the B-4As, delivered between January and April 1932, were the last biplane bombers delivered ...
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.
Keystone wall plates are made to work with many different types of cabling solutions, including coaxial, twisted pair, HDMI, optical fiber, etc. Keystone wall plates are made of plastic and have one to twelve ports. A keystone port is a hole in the wall plate which allows the insertion of a keystone module or other male or female cabling ...
The XB-2 competed for a United States Army Air Corps production contract with the similar Keystone XB-1, Sikorsky S-37, and Fokker XLB-2. The other three were immediately ruled out, but the Army board appointed to make the contracts was strongly supportive of the smaller Keystone XLB-6 , which cost a third as much as the B-2.
A portion of the arch surrounding the keystone is called a crown. [4] Keystones or their suggested form are sometimes placed for decorative effect in the centre of the flat top of doors, recesses and windows, so as to form an upward projection of a lintel, as a hallmark of strength or good architecture.