Gambling and the Law--Slot Machines

Where does the verb slot come from? The earliest known use of the verb slot is in the mid 1500s OED's earliest evidence for slot is from 1563, in the writing

The meaning of SLOT IN is to find a place for in a schedule, plan, etc How to use slot in in a sentence

who wants to be a millionaire roulette slot Who is Arne Slot? ⭕ Gary Cotterill gets the lowdown on Jurgen Klopp's potential successor at

who invented the slot machine What is SLOT meaning?