Drum machine changes would result in a null at the punner in an intermediate state.

卷筒推力的保持导致满转轮在洋间状况处单程摆动。

The agriculturist, Wang Chen-ho creations of wood for insertion of success, he also invented the punner racks, with a simple machine, increasing the efficiency of the typesetting.

了元代，农学家王祯创制木活字成功，他了转轮排字架，用简单的机械，增加排字的效率。