A mobile apparatus , comprising: a mobile carriage ; a pedestal supported by said mobile carriage ; a boom having a proximal portion coupled to said pedestal , said boom defining a lumen; an implement connection apparatus rotatably connecting a pressurized fluid-driven implement to a distal portion of said boom for rotation of said implement about an actuator axis , said implement connection apparatus being characterized by : (i) a rotary actuator having a housing defining a chamber , a shaft having first and second ends and extending axially through said chamber for rotation relative to said housing about said actuator axis , said shaft being rotated by a translator mechanism that is axially driven parallel to said actuator axis in said chamber ; and (ii) a pressurized fluid circuit for delivery of pressurized fluid through said rotary actuator (60 to said implement , said circuit having a feed manifold at said first end of said shaft , a delivery manifold at said second end of said shaft , and first and second channels fluidically coupling said feed manifold to said delivery manifold axially through said shaft , wherein said feed and delivery manifolds are rotatable with said shaft relative to said housing ; (iii) said implement connection apparatus being connected to said boom with said feed manifold positioned within said boom lumen. a mobile carriage ; a pedestal supported by said mobile carriage ; a boom having a proximal portion coupled to said pedestal , said boom defining a lumen; an implement connection apparatus rotatably connecting a pressurized fluid-driven implement to a distal portion of said boom for rotation of said implement about an actuator axis , said implement connection apparatus being characterized by : (i) a rotary actuator having a housing defining a chamber , a shaft having first and second ends and extending axially through said chamber for rotation relative to said housing about said actuator axis , said shaft being rotated by a translator mechanism that is axially driven parallel to said actuator axis in said chamber ; and (ii) a pressurized fluid circuit for delivery of pressurized fluid through said rotary actuator (60 to said implement , said circuit having a feed manifold at said first end of said shaft , a delivery manifold at said second end of said shaft , and first and second channels fluidically coupling said feed manifold to said delivery manifold axially through said shaft , wherein said feed and delivery manifolds are rotatable with said shaft relative to said housing ; (iii) said implement connection apparatus being connected to said boom with said feed manifold positioned within said boom lumen. (i) a rotary actuator having a housing defining a chamber , a shaft having first and second ends and extending axially through said chamber for rotation relative to said housing about said actuator axis , said shaft being rotated by a translator mechanism that is axially driven parallel to said actuator axis in said chamber ; and (ii) a pressurized fluid circuit for delivery of pressurized fluid through said rotary actuator (60 to said implement , said circuit having a feed manifold at said first end of said shaft , a delivery manifold at said second end of said shaft , and first and second channels fluidically coupling said feed manifold to said delivery manifold axially through said shaft , wherein said feed and delivery manifolds are rotatable with said shaft relative to said housing ; (iii) said implement connection apparatus being connected to said boom with said feed manifold positioned within said boom lumen. <EOS>