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Médias: Images- Situation géographique: Nassagaweya
- Types de document: Glass negatives
- Types de document: Photographs
- Année: 1938
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- P. L. Robertson, Roger Ptolemy, Ted W. Gazley
Peter Lymburner Robertson, 1879-1951. Inventor, industrialist. Inventor of the Robertson Recess Screw. For more information, see "P. L. Inventor of the Robertson Screw" by Ken Lamb. Peter Lymburner Robertson, 1879-1951. Inventor, industrialist. Inventor of the Robertson Recess Screw. For more information, see "P. L. Inventor of the Robertson Screw" by Ken Lamb.Milton Historical Society
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