| 摘要 |
he new technique disclosed herein simplifies traditional techniques practicable by farmers in ploughing or showing or arranging the soil. More precisely, it makes great reductions in the profit of farmers, consumers and national economy, in generalby simplifying such time-consuming works demanding high-cost man-hours and labour as well as the use of different hand- or mechanically-driven means employed to attain same purpose. The invented mechanism A, B, |
