Scientific Americar 320 ‘AprIL 16, 1904. … ROTARY PUMPS AND ENGINES. WALTHAM MANUFACTURING CO. Their Originand Development.—Animportant series o1 The fcllowing Manufacturers and Importers are licensed under the pioneer patent No. 549,160, granted to Waltham, Mass. Papers giving a historical resume of the rotary pump George B. Selden, dated…
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