Slightly OT to the discussion.

I worked in the PCB industry for over 17 years in machine maintenance and 
process line install and found that designs for multiple board manufacture 
varied a lot over the years from simple two sided 'punch and crunch' with 
routing and perforated break lines to individual 24 layer boards with 
complex routing profiles.
The advent of the cellular phone industry was where V-scoring came into its 
own on a scale never seen before with large multi-unit main boards with 
routing and V scoring to divide into smaller sub-boards containing up to 8 
units per section that were broken off after population.

There was a small company I used to service who, with limited financial 
resources, would create large boards with multiple sized rectangular 
circuits bound for different customers separated them by V scoring and 
after final test, split them into the different orders. This was a waste 
reduction exercise for them and proved successful in its operation.

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