Indianapolis

Johnson Piston Rings were originally called J&S Piston Rings, back in 1937. My father and grandfather started the business B Johnson & Sons Ltd, manufacturing motor engineers & grinding specialists. It was sited in Parnell Rise just above the railway bridge. The business was sold in the early 70s after my father died. I have been looking at an old brochure and saw the name J&S Piston Rings. I always knew them as Indianapolis 500 rings. Does anyone know when they were rebranded?