Advertising postcard mailed 1945. Back reads:
Duparquet Inc.
225-235 N. Racine Avenue
Chicago 7, Illinois
Our 90 years experience should qualify us to help you and our Engineering Department will be placed at your disposal for the proper planning of all types of food preparation and serving equipment if requested. – L.A. Florreich

It was mailed to the manager of the Finlen Hotel, Butte, MT. I wonder if the got the job?