Rotary air drill, Type R.A. I., for coal and medium hard stone, with 1 37/64” masonry drill bit, by Hardypick Ltd., Heeley, Sheffield, Yorkshire, England, 1948-1953 Rotary air drill 1948-1953
Sectional model of gold and silver mines at Asban, Sado Island, Japan, in two halves (scale of details 1: 30) Sectional model of gold and silver mines at Asban
Set of ""Proto" mine recue apparatus. (Ex Special Exhibition for the Blind) Set of ""Proto" mine rescue apparatus