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    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.

    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

    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 the P. L. Robertson Co., please consult "P. L., inventor of the Robertson Screw." by Ken Lamb.

    Good condition. For further information regarding P.L. Robertson, please consult "P.L. Robertson, inventor of the Robertson Screw", by Ken Lamb, and "Milton Area Biographies, V.2."

    For further information on P. L. Robertson, please see "P. L. Inventor of the Robertson Screw" by Ken Lamb and "Milton Area Biographies" 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 V.2."

    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.

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