[Boatanchors] Relay Contacts, etc.

[mac]

The old (40s/50s) IBM tabulating systems used hundreds of wire contact  
relays and the circuitry was specifically designed so that the  
contacts NEVER made or broke current.  Timing was such that all relay  
contacts were either open or closed before current pulses were sent  
through the logic.  These relays used removable wire contacts on the  
armatures and special burnishing and other tools were provided for  
their maintenance.  Does anyone remember the maintenance protocols for  
these components/equipments?

Dennis D. W7QHO
Glendale, CA