I was thinking this as well.
But it still stands to reason there has be another device that pre-dates the M147. It is a nearly a 40 year gap between the DFD Mk12/13/15 and the M147.
As you note it does say it replaces the chemical pens, so maybe they don't use a mechanical timer again until around 2000.
Can you provide a link to the pelleting doc?
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