Did they buy, or make their own, hand screws?
We have a partial answer: Initially they made their own, but in the latter half of the century, they bought at least some.
If they bought, then what was their supply?
We have a partial answer: from Bliss Manufacturing, and from Sandusky.
If they made their own, what are the distinctive characters, if any ?
Did they sell clamps to others?
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