Boll-Weevil or Other Insect Destroyer.
Description:
Patent for improvement to the machine set forth in the patent granted to John S. Doak and Alexander G. Farrington on April, 1902, No. 696419. (Page 1, lines 12-14.)
The improvements are to use “a pair of troughs connected to a truck and provided with upwardly-projecting wings on their outer edges, spring-arms attached to the truck and pressing normally against the wings and the outside parts of the troughs, spiral springs adjustably mounted on the truck and pressing against the spring-arms, an…
more
Date:
March 28, 1905
Creator:
Doak, John S. & Farrington, Alexander G.
Item Type:
Refine your search to only
Patent