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  2. Sliding door operator - Wikipedia

    en.wikipedia.org/wiki/Sliding_door_operator

    The operator is placed in the space above the sliding door. An electric motor, geared down to get a lower speed and a higher torque, drives a pulley at one end of a belt. The door is clamped to the belt. To open the door, the motor turns the pulley, which in turn turns the belt, which in turn drags the door. To close the door, the reverse occurs.

  3. Propel (company) - Wikipedia

    en.wikipedia.org/wiki/Propel_(company)

    Propel, Inc. is an American fintech software company that builds services for low income families. It is best known for Providers, a mobile app that allows users to track their Supplemental Nutrition Assistance Program (SNAP) balances and other government benefits.

  4. Glossary of climbing terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_climbing_terms

    A rock-climbing technique where a leg is held in a position to maintain balance, rather than to support weight, often to prevent a barn-door. [2] There are three types of flagging: [12] [11] normal flag Flagging foot stays on the same side (e.g. flagging right foot to the right side of the body). [12] [11] reverse inside-flag

  5. Swing-door operator - Wikipedia

    en.wikipedia.org/wiki/Swing-door_operator

    Shades of blue: standard door closer. Shades of red: opener gears. Gold: motor. Operators use various internal technologies. Some are built on top of a standard door closer. To open the door, the operator forces the closer in the opening direction. Then, the closer closes the door. The user may open the door manually, using just the door closer.

  6. Durdle Door - Wikipedia

    en.wikipedia.org/wiki/Durdle_Door

    The Door part of the name probably maintains its modern meaning, referring to the arched shape of the rock; [12] in the late 19th century there is a reference to it being called the "Barn-door", and it is described as being "sufficiently high for a good-sized sailing boat to pass through it." [10] People on the beach show the scale of the arch.

  7. Barn door tracker - Wikipedia

    en.wikipedia.org/wiki/Barn_door_tracker

    A barn door tracker, also known as a Haig or Scotch mount, is a device used to cancel out the diurnal motion of the Earth for the observation or photography of astronomical objects. It is a simple alternative to attaching a camera to a motorized equatorial mount .

  8. 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.

  9. P-38 can opener - Wikipedia

    en.wikipedia.org/wiki/P-38_can_opener

    ] The can opener is pocket-sized, approximately 1.5 inches (38 mm) long, and consists of a short metal blade that serves as a handle, with a small, hinged metal tooth that folds out to pierce the can lid. A notch just under the hinge point keeps the opener hooked around the rim of the can as the device is "walked" around to cut the lid out.