{TAIL ~ The present invention} relates to circuits that are used to change the logic levels from those useful of one family of devices to those useful of {HEAD ~ another family} of devices to effect communication between devices of these two families 
{ TAIL ~ The present invention } relates to circuits that are used to change the logic levels from those useful of one family of devices to those useful of { HEAD ~ another family } of devices to effect communication between devices of these two families
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