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History and other interesting information regarding the precision, hand-built Colortran Mini-Crab Dolly. The Mini-Crab Dolly was invented by television/film actor, William Sargent. Joining Mr. Sargent was actor/director, Robert Kelljan and together they teamed up as SarKell. If you're the owner of a Mini-Crab Dolly, register your dolly today and become a member of the exclusive SarKell Society.