The chain vise is commonly used to hold pipes or irregularly shaped objects. Main advantage over a regular pipe vise is the large clamping surface limited only by the length of the chain.
This particular chain vise is patented and features a cross slide with no apparent functionality.
What was this used for? As of now none know. I've research the patent number without success...

Methods I used to remove rust are the following:
- Electrolysis for large parts. Water + sodium carbonate and 12v battery charger with negative side connected to parts.
- Ultrasonic cleaner for small parts. First with solvent to degrease and then with rust removal fluid 20min each.
- Plain rust removal fluid for the chain leaving it overnight.
Everything was then cleaned from the patina with light passes on a steel wire brush mounted on the bench grinder.

0:00 Disassembly
2:09 Big parts rust removal
3:09 Small parts rust removal
4:04 Chain rust removal
4:33 Assembly
7:00 Test
7:34 What was this used for?

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