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Butt set TBR key

I recently acquired a nice butt set which I think is a progressive 385. There is a strange key that I can't figure out. It is labeled TBR. Can you tell me what this means? Otherwise I'm still searching the net for a manual to complete this unit.

Thanks,

Reply to
hudoff
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Timed Break Recall (i.e. hook flash).

Reply to
Phil McKerracher

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