Pneumatic door mechanism:
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Knock on the door
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The metal door of the compartment opens,
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The door shutters opens, closes
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Doorbell in a mansion
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Garage electric door opens, closes
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The wooden door closes
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The wooden door slams
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The metal door of the compartment closes
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Locked with a key, The padlock is opened
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Knock on the door, Doorbell
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Open, close, Insert the key into the lock
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The metal door closes
★★★★★