Need Substitute for PN 443-29

[James C. Clifford KE4DSP]

I am trying to cross reference an Integrated circuit Heathkit part number
443-29.  It is a buffer storage device in a 16 pin dip package.  The part
description in the manual is C'Greek letter mu'L9959 where 'Greek letter
mu' is the same as the micro symbol.
The decade counter has a similar part number 443-28 described as a
C'Greek letter mu'L9958 decade counter.
The local electronics shop has a complete NTE line but cannot cross
reference Greek letters.   We tried cross referencing on 9959, L9959,
C*L9959 and came up with nothing.  They suspect this is an OEM part.
Is there any way to cross reference this part?  Does anyone know of a
substitute?
Jim KE4DSP

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