The video you are watching Is a remote control excavator made from photo board paper and hydraulics made with syringes
And the other one is a truck made of paper photo boards. And has a DC gear motor to drive.


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See how to make an excavator and a truck at : -

how to make remote control excavator from photo board paper.
watch:    • How to make remote control hydraulic ...  

how to make remote control a truck from photo board paper. EP:1
watch:    • How to make remote control a truck fr...  

how to make remote control a truck from photo board paper. EP:2
watch:    • How to make remote control a truck fr...