Eight channel electroencephalograph comprising lead selector calibrator, amplifier and plotter by Beckman (Offner Division), Illinois, USA., late 1970s Eight channel electroencephalograph comprising lead selector calibrator 1965-1970
Eight channel electroencephalograph comprising lead selector calibrator, amplifier and plotter by Beckman (Offner Division), Illinois, USA., late 1970s. Almost identical to 1980-1415/2 except slightly newer and includes maintenance records in cabinet underneath main apparatus. Eight channel electroencephalograph comprising lead selector calibrator 1965-1970
