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A folding door is a type of door which opens by folding back in sections or so-called panels. Folding doors are also known as 'bi-fold doors', in spite of them most often having more than two panels. Another term is 'concertina' doors, inspired by the musical instrument of the same name.
The order initially consists of 545 cars, of which 20 are the open gangway prototype sets. There are two designs, the first ten cars utilizing interior panels in the gangway connection, and the other ten cars using interior bellows in the gangway connection. The latter design also contains a wider walkway and handles between cars. [31]
A folding door can have an electric folding door mechanism or manually operated. It is widely used on some older model city buses, mini-buses and school buses that have no air sources. Its features a whole frame design which can give it superior performance and excellent durability. It can be used in extremely hot and cold climates. Folding doors
Advantages of sliding doors are the small space requirements for door-opening, and their relative ease of automation. The mechanism is also secure, since it cannot be lifted out of its hinges. [6] Sliding doors are commonly found as store, hotel, and office entrances, used in elevators, and used as patio doors, closet doors and room dividers. [7]
Farfisa (Italian: Fabbriche Riunite di Fisarmoniche) is a manufacturer of electronics based in Osimo, Italy, founded in 1946.The company manufactured a series of compact electronic organs in the 1960s and 1970s, including the Compact, FAST, Professional and VIP ranges, and later, a series of other keyboard instruments.
The accordion is one of several European inventions of the early 19th century that use free reeds driven by a bellows. An instrument called accordion was first patented in 1829 by Cyrill Demian in Vienna. [notes 4] Demian's instrument bore little resemblance to modern instruments. It only had a left-hand buttonboard, with the right hand simply ...
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