I have had these BBC modules knocking around for a while, designed for use in industrial control. Basic logic gates and power driver stage all each in their own DIN mountable pack with interconnect leads, with the ability to daisy chain the power leads to all modules.
http://www.o2xygen.com/photo/SAA1029/SAA1029_001.pdfThe single Siemens logic IC, apparently a special batch made for Brown Boveri.
