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2. Sliding door operator - Wikipedia

   en.wikipedia.org/wiki/Sliding_door_operator

   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. Historically, elevator doors were opened using simple harmonic motion by a set of mechanical linkages; the motor, geared down, would rotate linked arms, which in turn would drive the door.

3. Flow control (data) - Wikipedia

   en.wikipedia.org/wiki/Flow_control_(data)

   A method of flow control in which a receiver gives a transmitter permission to transmit data until a window is full. When the window is full, the transmitter must stop transmitting until the receiver advertises a larger window. [5] Sliding-window flow control is best utilized when the buffer size is limited and pre-established.

4. Sliding window protocol - Wikipedia

   en.wikipedia.org/wiki/Sliding_window_protocol

   A sliding window protocol is a feature of packet-based data transmission protocols. Sliding window protocols are used where reliable in-order delivery of packets is required, such as in the data link layer ( OSI layer 2 ) as well as in the Transmission Control Protocol (i.e., TCP windowing ).

5. Automatic door - Wikipedia

   en.wikipedia.org/wiki/Automatic_door

   Heron used a similar application to open the gates to the city. [2] In 1931, engineers Horace H. Raymond and Sheldon S. Roby of the tool and hardware manufacturer Stanley Works designed the first model of an optical device triggering the opening of an automatic door. The invention was patented and installed in Wilcox's Pier Restaurant in West ...

6. Sunroof - Wikipedia

   en.wikipedia.org/wiki/Sunroof

   Removable roof panels (t-tops or targa roofs) open a vehicle roof to the side windows, providing a wider opening than other roof systems. The Targa body style is identical in configuration to the Sedanca but is designed for owner-driven rather than chauffeured cars and while a Sedanca style implies a rear passenger area, the Targa does not.

7. Sliding glass door - Wikipedia

   en.wikipedia.org/wiki/Sliding_glass_door

   This can include corner window walls, for even more blurring of the inside-outside open space distinction. Two-story versions are often electronically opened, using remote controls. For wide expanses, the opening point is centered, and three to six parallel tracks are used to carry the six to twelve sliding doors into the wall pockets on each side.