Back in the early days of ambulance service, not much was carried on the ambulances to treat the injured or sick. The ambulance crew mostly did transportation from the home to the hospital and little to no first aid was administered. Moving into the 1950's & 1960's ambulance services started to do some basic first aid, and carried first aid kits that were manufactured by companies such as Johnson & Johnson, etc. Below is a J & J First Aid Kit from 1961. It was originally sold by a drug store in Flint Michigan. I dated it from the information printed on the booklet inside the case.