What is techflexing?

Least number of valves required at the top of a four-stroke cycle engine? What is scope tube used for related to fluid coupling? Does a pneumatic spool valve require lubrication? What is EN08 normalised steel? Who made the first railway? What is cowl in firetube boiler? Is the pneumatic system efficient? What is blow-moulding? What is MTR in steel? Where is the filter located on a Moncrief gravity furnace model G-90? How can a rocket fly when there is no oxygen in space? Density of astm a36? What does a gear box on a wind turbine do? Is the mechanical advantage of a compound machine is related to the mechanical advantage of all the simple machines involved? What is radial drilling machine? What is the relation between absolute and gauge pressure? Define spinning jenny? What is considered heavy gauge steel? What drum machine does drdre use? Pass design for channel section in rolling mill?