Not an exhaustive list by any means

Roll your eyes, shrug your shoulders, frown in disbelief

http://www.freepatentsonline.com/crazy.html

Was Googling for a mortar spreader. Have a brick wall to make
(finally getting started on the outdoor pond/aquarium) and wondered
if anyone had thought of a device to lay mortar. They have

http://www.freepatentsonline.com/5035352.pdf

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