Those are 7 heat switches, also seen on Roper electric ranges in the 60s. They could have been made by ITT, International Telephone and Telegraph who owned Coolerator which not only made refrigeration products, but very fully featured electric ranges with timer controls for the ovens, the front 8" surface unit, the deep well and the convenience outlet on the TOL model. It was a beautiful early 50s range.
On 5 heat switches medium high was approximately half the heat of High. With a 7 heat switch, there was a step in between with one setting a little more and one setting a little less than half wattage. Likewise there was a step between medium and low, sort of a medium-low. They had all of the flexibility of infinite heat switches without the complications that could lead to switch failure and still worked with two separate inter-wound coils.