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- Isabella and Janet Robertson.Isa and Jessie Robertson were the sisters of P.L. Robertson. For further information see "P.L. Inventor of the Robertson Screw" by Ken Lamb.Isa and Jessie Robertson were the sisters of P.L. Robertson. For further information see "P.L. Inventor of the Robertson Screw" by Ken Lamb.Milton Historical Society
- John Robertson and Annie Brown Robertson.John and Annie Robertson were the parents of the inventor P. L. Robertson. John died in 1886 and Annie in 1909. John was an immigrant from Scotland and Annie was born in Canada, the daughter of Scottish immigrants. For further information see "P.L. Inventor of the Robertson Screw" by Ken …John and Annie Robertson were the parents of the inventor P. L. Robertson. John died in 1886 and Annie in 1909. John was an immigrant from Scotland and Annie was …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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