One-two-two-four model

Air two times using

averaged two times method

boundary line of two times between earth excavation area and earth fill area

carrier wave two times

Immersed in zincate solution two times

napping for two times

reciprocal law two times

the two times plating

two times aggregation

two times arrange material technic

Two times charging of molten iron

Two Times Fixed Position

two times punch

two times rolling rim

two times scheduling

Two Times Teach Method

two times tensioning

Two times zinc immersio plating