British Thornton P.I.C. No.P271 Student Log-Log (1
- maker:
- British Thornton Limited
British Thornton P.I.C. No.P271 Student Log-Log (10-inch) slide rule by British Thornton Limited with plastic case
British Thornton P.I.C. No.P271 Student Log-Log (10-inch) slide rule by British Thornton Limited with plastic case
