Using a tooth that is curled over the top of the chain, there are alternate teeth which point left and right.In 1946, American logger Joseph Buford Cox of Portland, Oregon invented chipper teeth, which is still widely used today and represents one of the biggest influences in the history of timber harvesting.
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During drilling or well interventions, the valve may be closed if overpressure from an underground zone causes formation fluids such as oil or natural gas to enter the wellbore and threaten the rig.
The annular blowout preventer was invented by Granville Sloan Knox in 1946 who received a patent on September 9, 1952.
Tupperware is airtight plastic containers used for the preparation, storage, containment, and serving of perishable food in the kitchen and home.
Tupperware was invented in 1946 by American chemist Earl Silas Tupper who devised a method of purifying black polyethylene slag, a waste product produced in oil refinement, into a molded substance that was flexible, tough, non-porous, non-greasy and translucent.
Available in many colors, the plastic containers with "burp seal" did not become a commercial success until Brownie Wise, a Florida housewife, began throwing Tupperware parties in 1951 in order to demonstrate the product and explain the features.
1946 Spoonplug A spoonplug is a form of fishing lure. "Buck" Perry, then a physics and math teacher in Hickory, North Carolina.Elwood Perry combined science with a logical approach to fishing to create a "total fishing system." He is credited as being the father of structure fishing and was later inducted into the National Freshwater Fishing Hall of Fame.A chipper teeth is a variant of a saw chain used on a chainsaw. A timeline of United States inventions (1946–1991) encompasses the ingenuity and innovative advancements of the United States within a historical context, dating from the era of the Cold War, which have been achieved by inventors who are either native-born or naturalized citizens of the United States. inventions from other historical time periods, please see Timeline of United States inventions (before 1890), Timeline of United States inventions (1890–1945), and Timeline of United States inventions (after 1991).Copyright protection secures a person's right to his or her first-to-invent claim of the original invention in question, highlighted in Article I, Section 8, Clause 8 of the United States Constitution which gives the following enumerated power to the United States Congress: On April 10, 1790, President George Washington signed the Patent Act of 1790 (1 Stat.