Trying to recover 67's prerecorded magnetic cards

[Dave Frederickson]

Degaussing is an excellent method of removing garbage data from magnetic media, like data from an out-of-alignment card reader or disc drive.

DO NOT degauss the hand-pulled cards for the 71B and 75 as these cards rely on a pre-recorded timing track. The timing track cannot be restored except by the custom machine HP used to originally write the card.