Design of a mechanical painting book for the Xinda
The cover of the mechanical drawing book
"The Little Machine Makes a Difference" story, pt
Pointers and English on the mechanical table
The pointer on the mechanical table
The gear machine
The Toon Machine Bird
The winch machine
The clock pointer and the gear
The Toon Machine Bird
The machine that makes dumplings
A large machine to lay the roads
The clocks are mechanical gears
Tools in the toolbox
Maintenance tool in the toolbox
The silver-white machine
Some parts of the machine
The side of the old black machine typewriter
Portrait of the plant and equipment piping
The gear with the hairline
A close-up for the gear
A mechanical worker in the middle of the day
The card in the hand of the machine
The light bulb in the machine's hand
The black phone in the machine's hand
The lab bottle in the hand of the machine
The card in the hand of the machine
The light bulb in the machine's hand
The black phone in the machine's hand
The lab bottle in the hand of the machine
It's a mechanical painting book cover