Strange Gearbox: Old Factory Maintenance Engineer Needs Help

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maxx_payne
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hello everyone i am a maintenance engineer in old factory so while we were working on an old machine yesterday we found a very strange gear box like the harmonic drives but it transmitts the motion from the motor shaft by a key to bearings those bearings transmitts motion to a elliptic shaped gears only by bearing rotation although the bearing can rotate smoothly
if anyone has an idea about this gear box pls help me
 
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maxx_payne said:
hello everyone i am a maintenance engineer in old factory so while we were working on an old machine yesterday we found a very strange gear box like the harmonic drives but it transmitts the motion from the motor shaft by a key to bearings those bearings transmitts motion to a elliptic shaped gears only by bearing rotation although the bearing can rotate smoothly
if anyone has an idea about this gear box pls help me

Pictures?