Record

RefNoMS/929/1/233
LevelItem
TitleLetter from Francis H. Williams, 505 Beacon Street, Boston, to James Mackenzie Davidson
Date20 March 1914
DescriptionWrites of a tube which Dr. W. D. Coolidge has designed. Explains that it can be adjusted to any degree of hardness in a few seconds and can carry almost any amount of current.
Extent3 sides
FormatTypescript
AccessStatusOpen
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