"At the beginning of the 20th Century the term “Pre-Hung Door” didn’t exist.
Neither did hand-held routers or routing templates. Hinges were mortised into
doors and door frames with keen chisels and skilled hands. Seeing how much time
finish carpenters spent laying out these mortises, Stanley Tools invented the
Butt Gauge

They got that wrong - Fulton actually patented one with 3 blades, not 2, in
1888, and his was not the first one

http:
//datamp.org/patents/displayPatent.php?number=386,428&type= <http:/
/datamp.org/patents/displayPatent.php?number=386,428&type=">http://datamp.org/pa
tents/displayPatent.php?number=386,428&type=>

The Marden was the first one - 16 years earlier in 1872

http://datamp.org/patents/displayPatent.php?number=125823&type=

And Stanley made their 95 by modifying the Fulton patent just enough.  I don’t
know why Woodpuckers copied the 94 when the 95 was the most popular - made from
1897 to 1984 instead of 1909 to 1942.  So Stanley didn't invent it, it was in
the 19th c not the 20th, and they didn't copy Stanley’s most popular version.
Oh, and the cost - you can get a vintage Stanley for $6-10.

I have never figured out what the third cutter is for on the 95, but here it is
on my Fulton too:

https://www.flickr.com/photos/ruby1638/49133401842/in/dateposted-
public/">https://www.flickr.com/photos/ruby1638/49133401842/in/dateposted-
public/ <https://www.flickr.com/photos/ruby1638/49133354757/in
/dateposted-public/">https://www.flickr.com/photos/ruby1638/49133354757/in
/dateposted-public/>

This little guy is in excellent condition, complete with name and patent date

Ed minch