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Here is a 1925 Splitdorf Aero owner's manual. These were used by McCormick-Deering briefly ,John Deere and others. They had some annoying pot metal issues and were notoriously wimpy. Impulse couplers and housings often self destructed.
These springs take a beating and are often broken. The type B impulse with manual reset was used extensively by McCormick-Deering in their earlier years.
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