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並前往https://books.google.com.tw/books?id=M576qYXj5K0C&pg=PA1590&lpg=PA1590&dq=jt+sprockets&source=bl&ots=0NZgYhK-yV&sig=ACfU3U3x0aCDe8DuRNsuSP6PdC5_tjcbVw&hl=zh-TW&sa=X&ved=2ahUKEwjguK7vu5X2AhWHHKYKHSIzDnsQ6AF6BQjjARAD

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

... said spring means for both guiding each comprises two substantially coaxial sprockets , a chain trained 1. ... 62-514 JT 9 Claims the second position .

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