When one is a dashing French inventor one has little patience for clumsy mustache hygiene. This “apparatus for the cut of the mustache,” patented by Pierre Calmels in 1927, “gives the mustache the desired shape and automatically reproduces this shape without any possibility of error and without loss of time.” Adjust the guide once into the proper configuration and you can use it thereafter as a sort of stencil: Just hold the apparatus between your teeth and trim the whiskers to the designated length.

Edwin Green’s “design for a mustache-guard for cups,” below, was patented in 1898: The plate can be clamped to a teacup to keep one’s mustache dry. The idea was referenced a century later in a related invention — an “apparatus and system for covering and protecting the rim of a paint can.”