Gertrude Gadwall is a character created by The Walt Disney Company by Keno Don Rosa. She only appeared on The Donald Duck Family Tree as the wife of Clinton Coot and the Mother of Casey Coot and Elvira Coot (aka Grandma Duck).
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... device is covered by US patents 3,726,146 (1973) and 5,353,655 (1994) by L.A. Mishler and US patent 5,800,311 (1998) by P.S.Chuang.
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