Vacuum cleaning systems : $b A treatise on the principles and practice of mechanical cleaning

Cooley, M. S. (Maxwell Stephens) · 1949

Texts printed in italics and bold face in the source document have been transcribed between _underscores_ and =equal signs= respectively. Small capitals have been transcribed as ALL CAPITALS. MECHANICAL ENGINEER IN OFFICE OF THE SUPERVISING ARCHITECT, TREASURY DEPARTMENT, WASHINGTON, D. C.…

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