Bespoke engineering solutions provider, Branch Hydraulic Systems (Branch) has built and supplied a testing unit for Compact Orbital Gears (COG), a specialist gearbox and test rig manufacturer based in Mid Wales.   As part of a supply-chain-partnership, the Branch test unit is being integrated with a high-speed slave gearbox, designed and manufactured by COG, for the testing of main rotor gearboxes for a world leading helicopter manufacturer.