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Shovel dominant design is the round pointed shovel and various flat scoop shovels.  The end of innovation is Taylorism and access to non-human power equipment and tools.  Taylorism systemized human power material shoveling through time and motion studies with the goal of profitability.  Enjoyment and health for the  human labour is not a priority.

Fishtail lineage begins  when a shovel head meets an angle grinder cutoff disc

.  Design began using a sledege hammer and steel wedges for wood splitting,  as explorartion geologist the rock hammer was always in my hand.  With out a rockhammer in hand there was an absence of the trade.  the hammer blow exposes fresh rock chips. scythes, dutch hoe