The clamp bars secured a screen to a tensioning rail, which in turn increased the electrical connection between the two components . ()
2.
This was for screen-related clamp bars ( also known as a Wedge Grip ), that are used when mounting a screen on frame members.
3.
Many modifications of the basic design were made in the 19th century, with changes such as rack-and-pinion adjustment for the outer gauge and improved clamp bars.
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