Circuit boards are bar coded to allow tracking throughout the process from raw board creation to final assembly. When using a laser to produce a bar code, marks are typically made on a lasermarkable label or ink patch to prevent damage to the FR4 substrate because direct marking frequently results in pinholes through to the underlying copper layer.
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Laser lines
Fusion inches closer as ITER completes magnet system
The problem with a Tokamak shape for the fusion plasma, is that the magnetic field from the central solenoid reduces from the centre outwards, leading...