LOWELL, District Judge.
This is a bill in equity to restrain the infringement of reissued letters patent No. 15,637, granted June 26, 1923, to L. C. Jennings, and assigned to the plaintiff. The patent relates to a so-called vacuum heating system. Such a system depends for its operation on establishing a partial vacuum in the return lines from the radiators in a steam heating system. Its main features have been well known for some years. They comprise a low-pressure...
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