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並前往https://books.google.com.tw/books?id=bDS_h72EAFoC&pg=PA1250&lpg=PA1250&dq=door+barricade+bar&source=bl&ots=2mkMGmZqY5&sig=ACfU3U2ioyPIoBGlcZdeACHIpE0ViazKzQ&hl=zh-TW&sa=X&ved=2ahUKEwiEs5z0o473AhVVEYgKHW1uCGUQ6AF6BQiNAxAD

Official Gazette of the United States Patent and Trademark ...

... security bar swinging freely and clear of the first door jamb as the door is opened outwardly ; a second security bar hinge connected to said security ...

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