Difference between revisions of "John Gray (1874-1935)"
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John Gray (1874-1935), an Electrical engineer | John Gray (1874-1935), an Electrical engineer and director of [[BTH]] | ||
1917 Patent department of [[BTH]]<ref>The Engineer 1917</ref> | 1917 Patent department of [[BTH]]<ref>The Engineer 1917</ref> |