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Actions	Details Remove from selection Add to selection Title The Shielded Four Electrode Valve by Captain H J Round Reference UK0108 NAEST 085/14 Date 1927 Physical description Number of pieces: 1 Language English. Persons keyword Round H J Captain Conditions governing access Open Level of description file Hierarchy browser 110000001 NATIONAL ARCHIVE FOR ELECTRICAL SCIENCE AND TECHNOLOGY contains 323 parts UK0108 NAEST 085 R McVite Weston Collection contains 37 parts UK0108 NAEST 085/14 The Shielded Four Electrode Valve by Captain H J Round

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