THE COOLIDGE X-RAY TUBE.
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https://paperspast.natlib.govt.nz/newspapers/TS19301220.2.173
Bibliographic details
Star (Christchurch), Issue 19258, 20 December 1930, Page 19 (Supplement)
Word Count
4THE COOLIDGE X-RAY TUBE. Star (Christchurch), Issue 19258, 20 December 1930, Page 19 (Supplement)
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