A. F. BUBNS, in an article on testing of the crossbar system of telephony (Bell Lab. Rec., 20, No. 9 ; May, 1942), points out that in dialling systems a talking connexion is established through a ...

The Petroleum Equipment Institute announced that the 2012 edition of Testing Electrical Continuity of Fuel-Dispensing Hanging Hardware (PEI/RP400-12) now is available for purchase. The newly revised ...