Mar 13, 2012 Â·. The term age hardening is a general term referring to most (if not all) time and/or thermal treatments to increase the strength (and sometimes the ductility) of a heat-treated metal. It can result the release of built-in stresses or permit phases locked in (due to quenching) to transform .
NRA stands for National Rifle Association. The group was founded in 1871 as a recreational group designed to promote and encourage rifle shooting on a scientific basis. The NRA's path into political lobbying began in 1934 when it began mailing members with information about upcoming firearms bills.
The National Parent Teacher Association (PTA) is a non-profit organization dedicated to supporting the education of students in the United States, from preschool through high school.Thousands of public and private schools have local PTA units adapted to the unique needs of each school Every unit is run by unpaid volunteers.