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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.
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]
The accordion was spread across the globe by the waves of Europeans who emigrated to various parts of the world in the late 19th century and early 20th century. The mid-19th-century accordion became a favorite of folk musicians for several reasons: "The new instrument's popularity [among the common masses] was a result of its unique qualities.