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The Keller was an automobile produced by the Keller Motors Corporation of Huntsville, Alabama, United States, between 1947 and 1950. [ 1 ] [ 2 ] It was based on the earlier Bobbi-Kar produced by the Bobbi Motor Car Corp. of San Diego, California .
An attic ladder (US) or loft ladder (UK) is a retractable ladder that is installed into an attic door/access panel. They are used as an inexpensive and compact alternative to having a stairway that ascends to the attic of a building. They are useful in areas with space constraints that would hinder the installation of a standard staircase.
Werner Co. was founded in 1922 by Richard D. Werner as "R. D. Werner Co., Inc.," which specialized in metal moldings.R. D. Werner Co., Inc. became a leader in plastics extrusion during the World War II restrictions on civilian metal usage.
The ladder itself is capable of being converted into several heights and configurations from a single ladder. Configurations include a straight or extension ladder, an A-frame ladder, a staircase ladder (an uneven A-frame for use on stairs), a 90° ladder, and both sides of a scaffolding trestle achieved through a triple locking hinge.
X-deck ladder, a US patented ladder design that is a combination ladder and scaffold. [3] [4] Ladder of a fire escape in New York. Rigid ladders were originally made of wood, but in the 20th century aluminium became more common because of its lighter weight. Ladders with fiberglass stiles are used for working on or near overhead electrical ...
Telescoping in mechanics describes the movement of one part sliding out from another, lengthening an object (such as a telescope or the lift arm of an aerial work platform) from its rest state. [1] In modern equipment this can be achieved by a hydraulics , but pulleys are generally used for simpler designs such as extendable ladders and amateur ...