We had one of those on our pipeline milker system It was already used when we installed it in 1972, so may have been used in the 60's.
The unit we had was an aprox 8X12 stainless steel box with front lid. Inside was a little electric gear reduction motor with a white plastic cam wheel on the output shaft. a black micro switch with a little metal wheel on the end of the micro switch arm ran on the cam wheel.
Being the gear motor ran at a constant speed, I don't see how you could vary the pulsation rate, it woild still switch once per rotation of the cam wheel. You could vary the duration of the pulse by substituting a cam wheel with a longer or shorter cam lobe.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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