Vol. 2. t Improvement in Machines for Forming Rings Watch Case Centers etc. curved slides. turned in either direction ; the direction of WHAT IS PLANCHETTE, scientific american, 1868-07-08
Vol. 2. t Improvement in Machines for Forming Rings Watch Case Centers etc. curved slides. turned in either direction ; the direction of WHAT IS PLANCHETTE, scientific american, 1868-07-08
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