Typed correspondence, typed and signed forms, handwritten notes and illustrations relating to Brush Laboratories Company and Piezo electrical crystals Show moreTyped correspondence, typed and signed forms, handwritten notes and illustrations relating to Brush Laboratories Company and Piezo electrical crystals. Typed letter from Edward R. Alexander to Charles F., Jr., dated December 14, 1926, regarding patents for Brush Laboratory Piezo electrical crystals and related technology. Typed response from Charles F., Jr. to Alexander, dated December 16, 1926. Nineteen separate typed and signed forms, dated 1930, 1931, 1932, or 1933, stating that the signer has been shown, in confidence, the experimental works being carried out at Brush Laboratories on Piezo Electric Crystals or machines using these crystals. Handwritten notes and illustrations regarding Piezo electric technology, no date, unknown author Charles F. Brush, Sr., Papers Series 9: Brush Companies (1880s-1933) Subseries 1: The Brush Laboratories Company (1921-1933) Box 29 Folder 16 Show less
