1999IEC 61337-1-2:1999 Filters using waveguide type dielectric resonators - Part 1-2: Test conditions
IEC 61337-1-2:1999 Filters using waveguide type dielectric resonators - Part 1-2: Test conditions was changed to IEC 61337-1:2004 Filters using waveguide type dielectric resonators - Part 1: Generic specification.