A great history of EMS is found at Synthesizer Museum Electronic Music Studios products found their way into the hands of some of the pioneers in using electronic musical instruments. They produced some of the first compact synthesizer products along with the EML Electrocomp. Here's a nice SOS Article.

Products:

VCS3 / SynthiA/AKS/E Synthi 100 Vocoder 2000 Vocoder 3000