Masco- Model Midgetalk - Intercom - Original Service Manual - 1950

Masco- Model MHP-110X - Amplifier - Original Service Manual - 1950

Masco - Model MA-10EX - Amplifier - Original Service Manual - 1950

Masco - Model MHP-110 - Amplifier - Original Service Manual - 1950

Masco - Model MA-10HF - Amplifier - Original Service Manual - 1950

Masco - Model MHP-110X - Amplifier - Original Service Manual - 1950

Masco - Model MC-126-126P - Amplifier - Original Service Manual - 1950

Masco - Model WFP - Intercom - Original Service Manual - 1956