1960s
Brush Instruments ~ division of Clevite
~ Preamps 4600 Series ~ Advertising booklet specs sheet
Comes from a former missile engineer for the US Air Force.
Was employed under this position during 1950's and 1960's, may have continued on afterwards, all the paperwork I have are from that period.
Superb condition
. Well cared for. pages are clean and crisp. Looks like it could have been printed recently not 60 years ago
The Antenna Specialists Co. was a division of Orion Industries, Inc.
They manufactured amateur radio antennas.