THE HELIOSCOPE. AO' I 1. PUNCHING AND SHEARING MACHINE. DOUBLE SHEARING PUNCHING AND STRAIGHTENING MACHINE., scientific american, 78-03-16

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THE HELIOSCOPE. AO' I 1. PUNCHING AND SHEARING MACHINE. DOUBLE SHEARING PUNCHING AND STRAIGHTENING MACHINE., scientific american, 78-03-16

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