Q-Filter, Bass Filter cable and Plugs, and T-shirts
Bill was very specific in the sound he wanted for his gear, no noise. There are so many ways to use the q-filter, two ways is is for the q-filter to take the place of the tone control or to use it instead of split coil.
Bill used low-capacitance cable and he designed push on plugs that make for very easy assembly.
When Bill first came to the US in the early 1960's in his shop in Greenwich Village he worked on so many player's guitars, wiring and designing pickups. One young man to work in his shop was Larry Dimarzio, and he is the one who gave Bill the name, The Godfather of Replacement Pickups. It is really true, Bill mentored and impacted the industry in countless ways.