Good to control flow rate Roller Clamp, new in shape and function: comfortable to hold and handle, more accurate to set the droprate, easier to roll. Instant drop speed adjustment. The large-dimensioned roller clamp enables secure gripping.
A nice example of Bostrom's Level. Lacking a model number, and given the early patent date, this may be model #1. The device is used for sighting a level line.
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