Dental treadle drill, owned by Gladys Muriel Seal (LDS, RCS Eng. 1923) by C. Ash and Sons, England, 1923-1926 Dental Treadle Drill 1923-1926
Dental treadle drill, Parsons Shaw type, incomplete, by the S.S. White Dental Manufacturing Co., USA, 1900-1925 Parsons Shaw Type Dental Treadle Drill 1900-1925