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Bridgeport, Conn
Patd. April 8, 1913
These are wooden clamps with steel screws and a large thumb screw that releases
the pressure when you twist it.
(Description supplied by Trevor Robinson)
This example has suffered some damage, but has the happy consequence of showing
some of the internal mechanism.
On some examples, there is an additional line
Bridgeport, Conn.
last revised and validated
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