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    Three employees of P. L. Robertson Manufacturing Co. Ltd., at their annual picnic. Left to right - Bernice Rusk, June Cooper, Doreen Walton

    Queenie Merrett, stenographer at the P. L. Robertson Company in the 1920s

    Doreen Walton was a stenographer at the P. L. Robertson Company, Milton...

    Sheeny Shepherd and Gordon Mackenzie worked at the P. L. Robertson Manufacturing Company, Milton...

    P. L. Robertson (right) and his brother and P. L.'s house in Milton, Ontario

    L-R Gordon Mackenzie, Karl Ansingh, Richard Alway, Ontario Heritage Foundation

    Installation of the P. L. Robertson heritage plaque. L-R - Don Knight, MPP, Len McNeil, President, Gordon MacKenzie, Mayor Gordon Krantz.

    L-R Gordon MacKenzie, Richard Alway, Ontario Heritage Foundation

    L-R Richard Alway, Ontario Heritage Foundation, Gordon MacKenzie, Len McNeil.

    P. L. Robertson outside the plant in Milton

    Black and white photograph of P. L. Robertson in dark suit with his hands in the pockets.

    P. L. Robertson seated on chair outside his house on Margaret Street accompanied by unknown young lady. Tree on right hand side of picture. Taken probably in late winter or early spring because there are no leaves on the trees. The young lady is wearing a hat and belted coat. ...

    Peter Lymburner Robertson, inventor of the Robertson Screw. Photograph taken in his office in Milton, Ontario

    Peter Lymburner Robertson, 1879-1951,(left of picture) inventor of the Robertson Screw, with employees at the plant at Milton, Ontario.

    1st Row front) left to right:- Lorne Mountain, Joseph Drew, George Gilbert, Marshall Neilson, Ralph Whitney, Dennis Rowley, Jim Gilbert, Cliff Houston. 2nd Row (middle) left to right:- J. B. Nicholson, Jim McEachern, Harold McMillan, Elwood Gullis, Frank Shannon, Frank Jones, Rita Nayler, Robt. Brush, Marty Warren, Eric Merkley, Percy ...

    Note from donor - "P.L. smoking his favourite "Arabella" cigar, cost 5 cents each at the time." 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...

    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...

    P. L. Robertson inspecting new roof on the Plating Department.

    Photograph taken at the P. L. Robertson Manufacturing Co. Limited...