I pulled this info off of SP:
One of Charles Peterson's most iconic patents was for the P-Lip design in 1898, still used today across Peterson's portfolio, but what many don't know is that he also patented another mouthpiece design six years later: the NAP stem, which appeared in Peterson's 1906 catalog only to fade into obscurity and eventual discontinuance in 1928. An almost forgotten innovation, the NAP stem featured a unique button that distributes smoke across the palate via five individual slots from the airway and a "clamshell" design with vents at each side and a horizontal gap at the front. Such engineering won't allow the stem to pass a pipe cleaner, but the idea behind the NAP stem is that, unlike the P-Lip which orients smoke upward across the roof of the mouth, smoke is distributed evenly across the palate. Silver has been fashioning NAP stems by hand since 2019, revitalizing the design, and detailed accounts of her
process and of the
results can be find at Mark Irwin's renowned Peterson Pipe Notes blog. Cutting such a stem requires time-consuming process and much hands-on work
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