Heathkit Frequency Counters

[Gary Fortnum]

A few days ago I asked for information comparing four models of counters
that were made by Heath/Schlumberger. I have received info, with thanks, on
one of the models (SM-110) but the other three seem to be a little elusive.

Does any one have a catalog from around early to mid 70's to compare the
differences of models SM-109, SM-118, SM-128?

Can anyone suggest where else I might try?

It would be greatly appreciated.
Thanks,
 Ga

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