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Scientific American, Vol. 62, No. 14 (1890) (1890)
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o protect all through the magnet, the valve will be opened. Compressed classes of traffic, and accordingly the system has been put in air will be admitted above the piston, which will be depressed, operation on the four tracks. and as it goes down will force the semaphore in opposition to Asa very… … © 1890 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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