British Pyrex Strain with JP Marking

By Caleb Thimell; posted December 13, 2006

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Here's a typical looking straw tint Pyrex glass radio antenna strain. Turn it over and check out this stylish "JP" initials for Jobling-Purse, the name of the founder and his nephew who joined the James A. Jobling & Co Ltd in 1902. In 1931 Jobling won the rights to manufacture and sell Pyrex glass products in the UK (except Canada). In 1971 Corning bought the rights back along with ownership of the entire company! Insulator was made in England. Special thanks to Jim Singleton for sharing this info.