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Boll-Weevil Device.
Patent for a cost-effective device that can remove and exterminate parasites from cotton as it's being harvested without damaging the cotton itself, including illustrations.
Date:
December 28, 1920
Creator:
Reeder, Leonard F. & Jackson, Walter B.
System:
The Portal to Texas History
Dental Impression-Tray.
Patent for improvements in dental impression trays that is adaptable for when there is only one or a partial set of teeth. There is a separate, smaller dental impression tray that is easily accessible and can be adapted to take impressions of one tooth or partial teeth.
Date:
August 31, 1920
Creator:
Littlejohn, Thomas F.
System:
The Portal to Texas History
Cotton-Chopper.
Patent for agricultural machines to "permit the chopper to pass predetermined plants during the operation of the machine through a planted field." (lines 13-16)
Date:
June 15, 1920
Creator:
Hart, Granville M. & Wall, James Edgar
System:
The Portal to Texas History