共 50 条
- [1] A magnetic mercury flotation valve for high-vacuum works ZEITSCHRIFT FUR ELEKTROCHEMIE UND ANGEWANDTE PHYSIKALISCHE CHEMIE, 1930, 36 : 253 - 253
- [8] A greaseless high-vacuum valve INDUSTRIAL AND ENGINEERING CHEMISTRY-ANALYTICAL EDITION, 1939, 11 : 0396 - 0396