The Handle may be a different shape, it may have two shifters on opposite sides of barrel, chuck might be different.
This sprial/ratchet screwdriver looks very similar to the basic NORTH BROTHERS MANUFACTURING CO. (YANKEE) No. 30

The maker marks on this tool usually appear around the upper and lower ends of the shifer barrel inside a zig-zag band.
This automatic drill probably looks very similar to the NORTH BROTHERS MANUFACTURING CO. (YANKEE) No. 40l>

There may be no maker marks on this tool.
There may be no maker marks on this tool.

S. F. BOWSER & CO. / PAT. APPD. / FT. WAYNE, IND
There are four different models
which bear inscriptions similar to this. I am particularly interested
the
model which has a single spiral (RH only).
may be no maker
marks on this tool.

This is similar to the other Decatur Coffin Co. screwdrivers but utilizes a socket/chuck for interchangeable screwdriver tips (single spiral, clockwise only).

Most H. Mueller spiral screwdrivers which you will see follow closely the basic conventional patterns of other makers and do not resemble the patent illustration at all. This Illustration is of an earlier model in the style of an Archimedian drill which does resemble the patent (exposed shaft with sliding handle which houses the clutch mechanism).

Rwo models of this screwdriver - with a return spring and without a return spring

Single spiral, RH only, interchanagle bit, rosewood handle

This may be the only marking or may have other markings related to Gilbert T. Sutterly
Single spiral, RH only, interchanagle bit

This is another form of the Sutterly patent above. This may be the only marking or it may have other markings related to Gilbert T. Sutterly, Philadelphia.
Single spiral, RH only, interchanagle bit

Double spiral/bo-directional, interchanagle bit
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I would appreciate hearing from you via e-mail if you have one of these or any other unusual or early spiral screwdrivers.
©1996 Clifford D. Fales All Rights Reserved