5789door knockersTTen-USVocabulário Colaborativo em Artes e Arquitetura active approved door knockersAppendages, usually of iron or brass, fastened to a door and hinged so that it may be made to strike against a metal plate or the door itself, to attract the attention of those within. Door knockers are usually placed on exterior doors.

Source: AAT

http://vocab.getty.edu/page/aat/300080114

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