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Médias: Objets- Médias: Images
- Groupes: Milton - P. L. Robertson Collection
- Année: 1920
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- P. L. Robertson with employees.
For further information regarding P.L. Robertson, please consult "P.L., inventor of the Robertson Screw" by Ken Lamb and "Milton Area Biographies, Vol. II", by Alex Cooke. For further information regarding P.L. Robertson, please consult "P.L., inventor of the Robertson Screw" by Ken Lamb and "Milton Area Biographies, Vol. II", by Alex Cooke.Milton Historical Society
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