Improvements in or relating to mine-ventilation or similar ducts

摘要

758,350. Band clips. SCHAUENBURG, H. G. Feb. 27, 1953, No. 5601/53. Class 44. [Also in Group XXVIII] A split clamp 25 having an internal peripheral groove and for connecting the adjacent ends of flexible ducts is provided with a rack 10 the teeth 26 of which are engageable by a pin 29 on a lever 28 connected to a pivoted toggle lever 27.