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PCE
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CPC Subgroup
E21D 21/02

having means for indicating tension (screwed connections specially modified for indicating tensile load F16B31/02)

Full Title

Anchoring-bolts for roof, floor , or shaft-lining protection (; dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose F16B13/00 ) > having means for indicating tension (screwed connections specially modified for indicating tensile load F16B31/02)