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What is the difference between rigid and flexible coupling.
Unfortunately, the answer to that question is difficult to come by without knowing the location and use of the rotary couplings. The answer could be anywhere from $200-$2000. Please specify use for rotary couplings.
The Janney coupler was named after Eli H. Janney who patented the invention in 1873. The Janney coupler was an improvement in railroad car couplers that became the standard for the railroad freightcar couplers.
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