Bestücken is really put components onto the PCB, "assembel" is one step further.

Step 5 overview of the making the robots
1. fabricate printed circuit boards
2. populate printed circuit boards with components
3. program microcontroller
4. fabricate robot plastic parts
5. assemble robot plastic parts
6. assemble magnetics into robot frame
7. assemble electricals into robot frame
8. test


Printed Circuit Board (PCB) Fabrication Services (641 companies) Printed circuit board (PCB) fabrication services design and fabricate circuit boards. They differ from electronic manufacturing services, which populate and assemble boards.


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Note added at 52 mins (2006-05-20 18:22:39 GMT)
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assemble of course