海量图书期刊资源,随时随地畅享阅读乐趣
Powdered coal offers automatic home heatR.H. Oppermann · 1947
2000 horsepower gas turbine generator setR.H. Oppermann · 1947
Powerful electro-magnet aids researchR.H. Oppermann · 1947
Refining vegetable oils by petroleum methodsR.H. Oppermann · 1947
Old process solves gas turbine problemR.H. Oppermann · 1947
Gas-turbine locomotiveR.H. Oppermann · 1947
Dry chemicals extinguish textile lint firesR.H. Oppermann · 1947
The new Montville turbineR.H. Oppermann · 1937