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    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.

    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 Scott

    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 o