Vintage 1941 Robbins Co Ultrasonic Dog Whistle With Woven Lanyard & Button, Theodore Leavens Patent 2245484

Good working condition.
The 1941 patent was assigned by Mr. Leavens to The Robbins Company of Massachusetts and, in part, reads as follows:
One of the objects of this invention is to provide a whistle which will be of sufficiently high frequency so that it may be heard by a dog but not heard by the human ear.
Another object of the invention is to provide for an adjustment of the pitch of the whistle with a means for holding the adjustment in set position.
Another object of the invention is to provide a whistle which may be adjusted to a selective pitch which if continually used at this pitch may be recognized by the dog, while the pitch may be differently selected from that used by others.
Another object of the invention is to provide an extremely simple whistle which may be manufactured and assembled quickly and inexpensively.
I have provided a whistle which will emit a high frequency note so that it may be heard by the dog but not by human ears, although I have provided an adjustment so that some notes may be heard if desired.

18%

Lisa Young | (802) 952-9094 | gnldesigns2@yahoo.com

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