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0val 17 kg deformed Average wear blade/head Brinell Hardness Number cause fracture cause permanent damage chisel end colours column Constr Construction forked hoe construction handle construction hoes Construction shovel construction type cubic metre damaged 0 30 deformed at blade design features Dimensions refer excavation Farm damaged Farm forked hoe farm handle farm hoes Farm long service farm pick Farm shovel farm tools farm type features and quality Forged construction forked hoe blade gang list Hardness Number Location heat treated Impact test Initial selection test Kenya ks ks ks laboratory test results labourer load of 50 Load to cause manganese measured number and name number number Oval eye Permanent set phosphorus pick axes point end productivity recorded refer to Appendix Repl Round eye Sample sharpened splin taper tip Tool Tool combinations tool handles Total Number Type Case Tool types of tools wear per day Weight Tool Welded construction