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.