Notes: "This is a small slide rule made as an advertising / promotional item. The body of the slide rule is folded sheet plastic, and the slide is a single flat piece of sheet plastic, nothing new here. The cursor, on the other hand, is clear plastic sheet wrapped around the rule and closed with two rivets at the top. The rivets double as anchors for the cursor spring. The really interesting part is on the back, where there are two ‘bumps’ in the body of the slide rule that keep the cursor from sliding off the ends, and the cursor has cutouts for those bumps to allow full travel to the end of the rule. "