Official Gazette of the United States Patent Office

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... front wall at the lower end thereof , a latch - bar pivoted at its inner end within ... cross bar , and manually operable means for raising or lowering the cross bar . 搜尋圖片地圖PlayYouTube新聞Gmail雲端硬碟更多»登入圖書我的圖書館說明進階圖書搜尋下載ePub版下載PDF純文字電子書-免費 服務條款   純文字PDFePub版



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