🚀 go-pugleaf

The following link is to an advertising brochure from the
Automatic Electric Company (of Chicago) for their line
of dial Private-Automatic-Exchanges in 1952.

They were generally intended for use as a separate private
telephone system for use _within_ an organization.  They were
not interconnected with outside Bell Telephone lines.  They
were usually sold, not rented, and over the long run saved
money, especially in large organizations that had their own
maintenance staff.

Many school districts, transit companies, and industrial sites
used them for internal communications.

On the second page/right column of the brochure, note the
many special features.  I wonder how many modern electronic
PAX's could do all of them.

One feature was that the PAX's were sized.  Schools, for
example, liked the Type 32A38 intended for light-traffic.  It
supported only one conversation, but allowed up to 100 telephones
and some special features.  It was modestly priced since the
switchgear was very simple.

http://www.telephonecollectors.info/index.php/browse/catalogs-manuals-educational-docs-by-company/automatic-electric-2/3680-ae-brochure-p-a-x-business-telephone-system


There were multiple companies making PAX equipment.  Another
was the North Electric Company, of Galion, Ohio.  Their
brochure is as follows:

http://www.telephonecollectors.info/index.php/browse/catalogs-manuals-educational-docs-by-company/north-electric-2/3676-north-brochure-all-relay-automatic-telephone-systems
 
 
Another company was the Kellogg Switchboard & Supply of Chicago.
Note on the last page there is a photo of the company's plant.
In years past, many industrial companies proudly included such
pictures in their advertising brochures.
http://www.telephonecollectors.info/index.php/browse/catalogs-manuals-educational-docs-by-company/kellogg-1/12229-kellogg-sop-brochure-may59

As an aside, Kellogg was located at 6650 S. Cicero in Chicago.
According to google-streetview, that site is now a Dunkin Donuts.
So many industrial sites have been razed or abandoned.