ANSWERS: 1
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The exact date when potato ricers were invented is unknown. In 1918 "Mrs. Norton's Rocky Mountain Cook Book" made mention of a potato ricer as if it were a common household tool, and in 1932 the first patent for a potato ricer was issued to George E. Stein.
Source:
freepatentsonline.com: Potato ricer, United States Patent 1885873
"Mrs. Norton's Rocky Mountain Cook Book Third Edition"; Caroline Trask Norton; 1918
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