The PDP-3 (Programmed Data Processor-3) was the first 36-bit machine DEC (Digital Equipment Corporation) designed, although it was not offered as a product.
Only one PDP-3 was built, and that was by a customer in 1960. Architecturally, the PDP-3 was essentially a PDP-1 stretched to 36-bit word width.
Resources
PDP Timeline
PDP-1
PDP-4
PDP-5
PDP-6
PDP-7
PDP-8
PDP-9
PDP-10
PDP-11
PDP-12
PDP-14
PDP-15
PDP-16
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