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TSH 19—“Tastenschalter mit Hallelement”—is a series of Hall effect keyboard switches from RFT. Robotron keyboards that used Hall switches (not necessarily TSH 19) include K7604, K7606, K7631, K7632, K7634, K7636 and K7637. The reed equivalent is TSS (“Tastenschalter mit Schutzrohrkontakt”).

There appear to be at least two versions:

TSH 19
This uses an MH1SS1 Hall sensor from Czechoslovak manufacturer TESLA
TSH 19 F
This is specified in TGL 38855 and uses a VEB HFO B 461 G Hall sensor, possibly after East Germany introduced its own semiconductor fabrication