|NovEMBER 4, 1893. … $6.00 K 0 D A K $ $100.00 be used to produce the electrical action make. By G.M. Hopkin: ructed with motor devised and const on which the first patent rests. The third TO a battery, d from claim is for the use in such instruments of a diaphragm, made of a plate of iron lathe or any macht \\ith 11…
Internet Archive · Public domain (published before 1931). Free to use for anything.