Manley, Stereo Equalizer, models:

Enhanced Pultec Mid Frequency Equalizer	Owner'S Manual
Langevin MINI MASSIVE STEREO EQUALIZER	Owner'S Manual
Langevin Mini Massive	Owner'S Manual
Langevin Pultec EQP1-A	Owner'S Manual
Manley Massive Passive Stereo Tube Equalizer	Owner'S Manual