Does anyone know the code that Poitras used on their machinery? I have a model 2800 shaper I inherited from my Dad. The serial number is S.68.28.712. I'm guessing the 'S' is for shaper, the '68' is the year it was made (I still have the bill and my Dad bought it new in early 1969), the '28' is a truncation of the model number 2800, and the '712' is the unit number made in that year. This makes sense but its only speculation.