helium liquefier वाक्य
"helium liquefier" हिंदी में helium liquefier in a sentenceउदाहरण वाक्य
- On display are a helium liquefier and associated tools, devices to measure superconductivity ( e . g . rheostats ), and to automatically record measurements : a cathode tube, a thermograph, drum recorders and a paper tape recorder.