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Average wear blade blade blade Brinell Hardness Number cause fracture cause permanent damage chisel end colours column Constr construction forked hoes construction handle construction hoes Construction shovel construction type cracking cubic metre damaged 0 30 deformed deformed deformed design features Dimensions refer excavation Farm damaged farm forked hoes farm handle farm hoes Farm long service farm pick axes Farm shovel farm tools farm type features and quality Forged construction Forged Welded forked hoe blade gang list Hardness Number Location head/handle heat treated Impact test Initial selection test Kenya ks ks ks laboratory test results labourer load of 50 Load to cause manganese number and name number number Permanent set phosphorus point end productivity recorded refer to Appendix Round eye Sample sharpened splin taper Tool combinations tool handles Total Number Type Case Tool types of tools University of Nairobi wear per day Weight Tool Welded construction