slide with cardboard mount. Depicts stell taker trailer in warehouse along with two figures. Recto inscription top, in blue ink: "Feb '57 Westeel Prototype Semi Trailer." bottom left: "10." Recto captions in blue- top left: "date," right side: "made in Canada," left side: "Patented," bottom edge: "Project from this side arrow shows position." Verso captions in blue- "Mitchell Photo Supply Ltd. Dominion Sq., Montreal," bottom centre: "Processed by Etco."

slide in cardboard mount. Depicts semi tanker trailer and front end of orange pickup truck inside a warehouse. Recto inscription, top, blue ink: "Feb '57 Westeel prototype semi trailer." Recto captions in blue- top left: "date," right side: "made in Canada," left side: "Patented," bottom edge: "Project from this side arrow shows position." Verso captions in blue- "Mitchell Photo Supply Ltd. Dominion Sq., Montreal," bottom centre: "Processed by Etco."