My Eureka tank-type vacuum research led me down a Filtex rabbit hole. This is what I pieced together from the following sources: familysearch.org, Owen Perkins (YT), centvac.com, online database,
https://www.progress-hausgeraete.de/en-de/local/history/
August K. Hoppe (1894-1946) and Emma G. (Wahl) Hoppe (1904-1990) immigrated to the United States from Germany and were married at Indiana in 1936.
That same year they became the U.S. distributors of the German-designed Progress vacuum cleaners at 1814 E. 40th St., Jackson, Michigan. The parent company had formed in 1921 as an electrical equipment business adding vacuum cleaner production in 1926.
At one point the US subsidiary went by Electroair Progress Company. The lack of online information leads to speculation of whether Mr. and Mrs. Hoppe sold two makes, or if Electroair was also manufactured by Progress?
The Hoppe’s association with Progress was short-lived, and by 1938 they started transitioning into running their own business. The Eureka Vacuum Cleaner Company, located about 80 miles away, took over the Progress distribution in 1939 and aquired the business’s assets in October 1940. The equipment was moved to Detroit and the remaining stock of Progress vacuum cleaners was sold over the next several years.
Mr. and Mrs. Hoppe’s new company, Filtex Corporation, began as a subsidiary of the Sparks-Withington Company of Jackson. Their first patent in 1938 became the Model 1 tank-type vacuum cleaner first produced in 1939. Filtex made two versions of the Model 1 (perhaps the first in Jackson and the seond in LA) followed by the Model 2. In 1943, the Hoppes relocated the business to 415 E. 15th Street, Los Angeles, California; which was used for manufacturing airplane parts until the end of WWII. In 1946 classified ads stated that the “New Hygienic Filtex vacuum cleaners were available, these were presumably the Model (Type) 12 (see VL link below for photos). Around 1950 the Model 50 rolled off the assembly line followed by Models 19-A & 19-B in 1955. It may be that the main difference between the two besides the body colors was that the 19-A used a cloth bag and the 19-B a paper one. The former doesn’t appear to have been in production as long according to what little information I located.
Mr. Hoppe passed away in 1946, at which time Mrs. Hoppe took over the presidency of the company. She continued the production of tank-type cleaners and in late 1958 introduced the copper-colored Perma Vac built-in vacuum system line beginning with model S-300(?). After twenty years at the helm, Mrs. Hoppe retired.
Filtex was then acquired by Natter Manufacturing Corporation (NMC) and relocated to 9440 Gidley St., Temple City, California. Around the late 1970s the tank-type was discontinued, and the company focused on its built-in vacuum systems; changing the unit colors to various blue tones. NMC became a subsidiary of VSI Corporation in 1967, and in 1980, VSI was sold to Fairchild Industries, a diversified aerospace concern, which moved production to La Verne, CA. After several more acquisitions, the Filtex brand was discontinued around 2006.
Progress thread featuring Type 12:
https://vacuumland.org/threads/progress-vacuum-cleaner-inquiry.1326/
Attachments:
1. 1940 Sep 30 LIFE ad
2. 1955 CONSUMER UNION REPORTS BUYING GUIDE ISSUE (snippet overview)- model 19-A
3. 1955 LIST OF ELECTRICAL APPLIANCES supplement, p. 56 - Filtex model 19-B
4. 1957 CONSUMER UNION REPORTS BUYING GUIDE ISSUE (snippet overview)- model 19-B
5. 1976 ELECTRICAL APPLIANCE AND UTILIZATION LIST - UL - Filtex (snippet overview)
6. 1976 ELECTRICAL APPLIANCE AND UTILIZATION LIST - UL, p. 94, Filtex model list