Applied Scientific Research, Section B

, Volume 3, Issue 1, pp 141–141 | Cite as

A metal vacuum valve

  • G. M. van Koppen
Letter to the editor


Electron Microscope Rubber Technical Physic Vacuum Chamber Physic Department 
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Copyright information

© Martinus Nijhoff 1954

Authors and Affiliations

  • G. M. van Koppen
    • 1
  1. 1.Technical Physics Department T.N.O. and T.H.Electron Microscope DivisionDelftNetherlands

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