STEAM ENGINE INDICATOR WEITMYER PATENT FURNACE. BOILERS OF EVERY DESCRIPTION. COMPTOMETER Saves 40 per cent. of time. Entire relief from mental strain Adapted to all commercial and scientific computations. Send for circular., scientific american, 1890-03-22
STEAM ENGINE INDICATOR WEITMYER PATENT FURNACE. BOILERS OF EVERY DESCRIPTION. COMPTOMETER Saves 40 per cent. of time. Entire relief from mental strain Adapted to all commercial and scientific computations. Send for circular., scientific american, 1890-03-22
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