February 5, 1867 Samuel Mc Clain was awarded a patent for a mouth whistle.
January 5, 1897 Henry Gibson awarded the patent for the box caller.
July 20, 1912 William Saunders was awarded a patent for a crude Friction Slate call.
February 1, 1921 Henry Bridges was awarded a patent for an improved Mouth call.
August 18, 1949 Reuben Boatwright was awarded a patent for what I can best describe as a push button caller.