<span>Typed and handwritten purchase orders and invoices for February 1922, for products purchased by the Brush Laboratories Company from The Chemical Rubber Company. Supplies include glassware, Pyrex stoppers, acetone, </span><span>filter paper, tubing, and other materials used in experiments at Brush LaboratoriesCharles F. Brush, Sr., PapersSeries 8: Other Papers (1842-1960)Subseries 1: The Brush Laboratories Company (1921-1933)Box 29Folder 10</span>