Simple tools that have been a mystery



1. The mechanism through which is secured a second hand ratcheting
2. Radial engine 
3. Reciprocating 

4. That's working a sewing machine
5. Internal combustion engine

6. External combustion engine
7. Rotary-piston engine
8. Gun
9. Steam-engine
10. Autococker Paintball Gun 
 
11. Stirling engine
12. Steam-engine double-acting

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