Section 10,20: H

 nHc1c2c2...cn (Hollerith Editing)

 On input, transfers "n" characters from the external record to the
 field descriptor itself.  The first character appears immediately
 after the H.  Any characters in the field descriptor prior to the
 input operation are replaced by the input characters.

 On output, transfers "n" characters following the letter H from the
 field descriptor to the external field.