Full automatic pencils

[Pdunc67]

here is a link to a page I started where I was trying to delelop a list of automatic pencils.
It has a lot of gaps still - lots of unknown dates, etc.

Comprehensive list of Auto-Advance Pencils

This all started with me trying to figure out which of my “auto-advance” pencils were the oldest. The terms “automatic” and “auto-feed” or “auto-advance” have several meanings in the mechanical pencil world. Depending on who you ask, and in what context, you will get different answers. In regard to this list, these are all of the pencils (that I am aware of) that have the capability to advance the lead without the need to “knock” the pencil. I also tried to list them in chronological order.…