Vintage Black White Stock Photo from the Pratt Whitney Corporation. This image is described on the back and states, "One of Hampden's (Massachusetts) large heat treating ovens. Controlled pyronetically." Measures 8 x 10 including white border. Condition: This is an original photograph, not a copy or reproduction. It is in very good condition, with crop marks along bottom edge within white border region. Comments: This photo is part of a collection of official Pratt Whitney images (all sold separately). Not all the photos are dated, but those that are appear to be mostly from the 1950s. Pratt Whitney is based in Hampden, Massachusetts.