Odd gearcutter question

I've got some gearcutters (or something related) in my collection
which I don't know the purpose of - anyone able to shed any light?
first is like a Brown & Sharpe type gearcutter, but with straight
sides to the teeth instead of involute form. They are marked with the
included angle (45 deg) and what appears to be the width of the flat
tip of the teeth (.015").
Second are a couple of 'hobs', 20mm long & about 49mm OD, but conical
in form. The cutting section, with teeth in a spiral like a hob,
starts at the 49mm dia, reduces to about 43 mm over 16mm axial length.
The angle to the axis is about 15 deg. The teeth are highly
asymmetrical, one flank being almost square to the axis, the other
flank being of the order of 45 deg to the axis. They are marked with,
among other things, what might just conceivably be module sizes, one
of1.221, the other 2.355. Made by Mikron.
Any clues? I can send email pics if anyone has an idea but needs
clarification.
I doubt they could ever be any use to me, if so, I'm open to offers
from anyone who thinks they could use them.
Cheers
Tim

Tim Leech
Dutton Dry-Dock
Traditional & Modern canal craft repairs