Thermo-Hygrostat Relay using Bourdon Tube
ブルドン管を用ひた恒温恒濕リレー

Tokuzo MATUYAMA
1935 Journal of the Society of Mechanical Engineers  
doi:10.1299/jsmemagazine.38.224_861 fatcat:yua7t4a45fhrpakyth6cjnth74