“IRT Cross“ Mounting Bars CB 250, CB 200, CB 140
Versions
The CB 250 is the version which more closely
approximates the theoretical ideal, while the CB 200 is the original, somewhat smaller version.
Application Notes

CB 200 in use with four CCM 4 compact microphones (cardioids) and B 5 D windscreens
Colette
Surround