1660-A
The General Radio 1660-A Inductance Measuring Assembly was introduced in Catalog S (1965) and remained available through Catalog 1973.
The Type 1660-A is a combination of bridge 1632-A, generator 1311-A, and detector 1232-A sold as an assembly. Later models were available with a fitted metal cabinet.
A combination generator – detector was also available as the 1240-A.