Gears
Ollerenshaw, Chris
Triggs, Pat
Notes
Find out what gears are used for and how some work better than others. Instructions to build your own model helicopter.
Size: 8 up
upper age: 99
no information
| ISBN: | 0713633549 |
| pub: | 1991 |
| Subjects |
|---|
| MACHINE PARTS |
| Science - Experiments |