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- John Robertson's familyFor further information, see "P. L., inventor of the Robertson screw" by Ken Lamb.For further information, see "P. L., inventor of the Robertson screw" by Ken Lamb.Milton Historical Society
- Family home of P. L. Robertson, Seneca, Haldimand County, 1880.Left to right - John Brown Robertson, William Robertson (oldest of the boys), Annie (Brown) Robertson with P.L. in her arms, Hatton Robertson, Isabella (Isa), Janet (Jessie), John Robertson, father of P. L., and the groomsman with two horses. For further information see "P.L. Inventor of the Robertson Screw" by …Left to right - John Brown Robertson, William Robertson (oldest of the boys), Annie (Brown) Robertson with P.L. in her arms, Hatton Robertson, Isabella (Isa), Janet (Jessie), John Robertson, father …Milton Historical Society
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