Curiosity killed the cat. I Googled it. On Wikipedia.org, I found the following tidbit of information:
Thomas Jefferson is reputed to have invented the Lazy Susan[citation needed], which has been in popular use since the eighteenth century. Lazy Susans were originally known as dumbwaiters, although the name Lazy Susan replaced this term in the twentieth century, though no later than 1917. In many parts of the world including Britain, the term "dumb waiter" nowadays means something completely different: a lift or elevator for transporting items such as food and plates between floors of a house, usually from a kitchen to a dining room.
Interesting ! 
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