Typed and handwritten purchase orders and invoices for February 1922, for products purchased by the Brush Laboratories Company from The Chemical Rubbe Show moreTyped 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, filter paper, tubing, and other materials used in experiments at Brush Laboratories Charles F. Brush, Sr., Papers Series 8: Other Papers (1842-1960) Subseries 1: The Brush Laboratories Company (1921-1933) Box 29 Folder 10 Show less