Advertisement clipping for the Globe Geophone, a most sensitive and dependable instrument so far developed for accurately locating leaks in underground piping. The second page of this advertisement clipping includes the testimonials, notable users, and proof that this mechanical technology works. At the top of the first page is text in green handwriting that reads, “See Jeep file for letters on this.”.
Letter from Herbert T. Horne to Alex Bradford thanking Mr. Bradford for the payment in the form of a personal check of Twenty-five Dollars ($25.00) made out to Spray Engineering Company.
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