The leading edge slats of the 109 work through air pressure distribution and this is depending on the angle of attack. The slats deploy gradually over a small range of the angle of attack, making it possible for them to snap open in abrupt manoeuvres, but they can also be made deploy gradually when increasing angle of attack gently.
The leading edge slats were reworked with the F series in that their span was reduced and the mechanism simplified. I don't think the deployment was changed a lot.
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