PRO DEVICE
Reported as being produced in Singapore around year 2000, this clamp appears to have a screw-thread closure similar in principle to the Ismail Clamp. It is unclear whether it ever went into commercial production.

CIRCLAMP
This MAY be an attempt to produce a string-free version of the Plastibell (this piece replacing the string, the rest unchanged); the maker of the Plastibell at one point developed a disposable device reportedly called the "CIRCLAMP" although it was supposedly similar in design to the Tibone Clamp. Thus it appears likely that the name CIRCLAMP has been re-used.
There must be at least one other component involved with this device, not illustrated here. Note the overlap between the two halves of the spring-loaded clamping ring. Further details are required.

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