Great find for this drawing! Not trying to start a "flame fight" here, but isn't the "inter-cooler" in this instance more properly an "after-cooler"? As in, an inter-cooler should be placed between the stages of supercharger compression, (i.e., between a turbocharger compressor, and the engine-driven compressor) and this item is after all stages of supercharger. Often, technical terms are used interchangeably, when they should not, or with insufficient clarity. FAA A & P days will haunt you...