Classic contradiction matrix (39 engineering parameters/ 40 invention principles)

4. Length/angle of stationary object

6. Area of stationary object

12. Shape

21. Power

4. Length/angle of stationary object

-

17, 7, 10, 40

13, 14, 15, 7

12, 8

6. Area of stationary object

26, 7, 9, 39

-

-

17, 32

12. Shape

13, 14

-

-

4, 6

21. Power

-

17, 32

29, 14

-