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Saturday 10 March 2018 at 05:04
The Williams service bulletin books have now been scanned and uploaded:
http://www.pinwiki.com/wiki/index.php?title=Williams_System_9_-_11#Service_Bulletins
http://www.pinwiki.com/wiki/index.php?title=Williams_WPC#Service_Bulletins
Source: http://pinside.com/pinball/forum/topic/service-bulletines#post-4273003