In 1944 George A. Chandler of Muncie, Indiana, was granted a patent for a boring and facing head. This invention was subsequently manufactured by Chandler Tool Co., Inc., also of Muncie.
Information Sources
- 1965 catalog from this firm, showing their "Chandler-Duplex combined boring and facing heads" available in six sizes: J, D, 1½, 2½, 3½, and 4½.