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  2. Chamberlain Group - Wikipedia

    en.wikipedia.org/wiki/Chamberlain_Group

    Craftsman — re-branded Chamberlain models sold at Sears. Those products have a "139" model prefix to denote that the Chamberlain Group made them for Sears. Clicker — a line of universal garage door remotes. Chamberlain, LiftMaster, and Craftsman have interchangeable parts, primarily the gear and circuit boards.

  3. Garage door opener - Wikipedia

    en.wikipedia.org/wiki/Garage_door_opener

    The electric overhead garage door opener was invented by C.G. Johnson in 1926 in Hartford City, Indiana. [1] Electric Garage Door openers did not become popular until Era Meter Company of Chicago offered one after World War II where the overhead garage door could be opened via a key pad located on a post at the end of the driveway or a switch inside the garage.

  4. Garage door - Wikipedia

    en.wikipedia.org/wiki/Garage_door

    Sectional garage door Up-and-over garage door Garage Door Hardware. A garage door is a large door to allow egress for a garage that opens either manually or by an electric motor (a garage door opener). Garage doors are frequently large enough to accommodate automobiles and other vehicles. The operating mechanism is usually spring-loaded or ...

  5. Sears - Wikipedia

    en.wikipedia.org/wiki/Sears

    Sears, Roebuck and Co., commonly known as Sears (/ s ɪər z / SEERZ), [6] is an American chain of department stores founded in 1892 by Richard Warren Sears and Alvah Curtis Roebuck and reincorporated in 1906 by Richard Sears and Julius Rosenwald, with what began as a mail-order catalog company migrating to opening retail locations in 1925, the first in Chicago. [7]

  6. Sears–Haack body - Wikipedia

    en.wikipedia.org/wiki/Sears–Haack_body

    The Sears–Haack body is the shape with the lowest theoretical wave drag in supersonic flow, for a slender solid body of revolution with a given body length and volume. The mathematical derivation assumes small-disturbance (linearized) supersonic flow, which is governed by the Prandtl–Glauert equation .

  7. Monty Hall problem - Wikipedia

    en.wikipedia.org/wiki/Monty_Hall_problem

    If we assume that the host opens a door at random, when given a choice, then which door the host opens gives us no information at all as to whether or not the car is behind door 1. In the simple solutions, we have already observed that the probability that the car is behind door 1, the door initially chosen by the player, is initially ⁠ 1 / 3

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