Design of a universal portable electric drill . U. OF 1. S. S. FORM >. Il . 1 : 1 1 . ? 11 I I I i \—1 I , 11 ? , ? I I - ? - - ? i ? ? ? t ? - - . -:;: 1 1 /rm-rr U. OF 1. S. S. FORM 9

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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttheses, bookyear1920