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並前往https://books.google.com.tw/books?id=C-G8rUmWN5IC&pg=PA1491&lpg=PA1491&dq=drum+sheet&source=bl&ots=M8xScW8dnG&sig=ACfU3U0tAVJWL5NCFBIP5DxqTb84Tz9qaA&hl=zh-TW&sa=X&ved=2ahUKEwi95dKU8-n1AhWylosKHcuLALoQ6AF6BQjVAhAD

Official Gazette of the United States Patent Office

... positioned adjacent to the surface of the second drum means for producing a ... sheet , correlating the reference signal recorded on the second drum to ...

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