RANGITOTO BEACON: For many years Dr. Dalen's invention was used here and his sun-valve apparatus is still kept as a stand-by should the electric power fail.
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https://paperspast.natlib.govt.nz/newspapers/NZH19380129.2.252.43.3.1
Bibliographic details
New Zealand Herald, Volume LXXV, Issue 22949, 29 January 1938, Page 9 (Supplement)
Word Count
26RANGITOTO BEACON: For many years Dr. Dalen's invention was used here and his sun-valve apparatus is still kept as a stand-by should the electric power fail. New Zealand Herald, Volume LXXV, Issue 22949, 29 January 1938, Page 9 (Supplement)
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