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Wrench

Description: Patent for wrenches that provides a means for engaging faces of the jaws to be renewed or changed. This improvement also allows for secure placement without loss of motion.
Date: August 2, 1921
Creator: Belcher, Mark
Item Type: Refine your search to only Patent

Explosion-Hatch for Oil-Tanks.

Description: Patent for useful and new improvements in explosion hatches for oil tanks. This product specifically provides a hatch on the oil tank which will permit the escape of combustion gasses through the hatchway. It does so without damage to the hatch, case, or the tank. This provides additional safety and security for the operator.
Date: November 8, 1921
Creator: Hull, Burton E.
Item Type: Refine your search to only Patent

Roller Boring-Drill.

Description: Patent for a roller boring-drill with improved arrangement of cutters on the head, and formation of teeth on the cutters. This new head design is better for drilling formations that are not brittle.
Date: August 23, 1921
Creator: Fletcher, Harold W.
Item Type: Refine your search to only Patent

Valve-Cleaner.

Description: Patent for a valve cleaner to remove carbon from the internal combustion motors in automobiles. It can be used without removing the valve or motor.
Date: December 13, 1921
Creator: Henderson, Daniel D.
Item Type: Refine your search to only Patent
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