Scientific Ainevican, [OcToBeR 1, 1887. 222 … THECOPYING PAD.—HOW TO MAKE 3BEST and most RELI- OTTO GAS ENGINE WORKS, snd how to use; withanengraving. Practical directions ABLE for swift runoing. ELECTRIC CONVEYORS.—DESCRIP- how to Prepare ‘the gelatine pad, ard also the anilineink Chas. A. Schieren & Co. by whic e@ copies are made; how to…
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