THE DOORLESS DOOR.” It has been used in an experimental installation winter and summer to keep out insects, rain, snow, and cold air. , Meanwhile absence of the closed door resulted in increasing trade by about one-third. A motor operates the blower.
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https://paperspast.natlib.govt.nz/periodicals/P19200901.2.16.1
Bibliographic details
Progress, Volume XVI, Issue 1, 1 September 1920, Page 11
Word Count
41THE DOORLESS DOOR.” It has been used in an experimental installation winter and summer to keep out insects, rain, snow, and cold air. , Meanwhile absence of the closed door resulted in increasing trade by about one-third. A motor operates the blower. Progress, Volume XVI, Issue 1, 1 September 1920, Page 11
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