- Slidingdoorsmoveingrooves.Wheelsleavegroovesindirtroads.Irubbedthevelvetygroovesinsidethecalf'sears.Ifgroovesarecutintheflankofnuthydrostaticactionispossible.Stillmissing,itisclaimed,werethedrainagegroovesthatsiphonoffrainwater.Thescaleshelpstreamli...
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