Doug:
Firstly, the oil pumps were Hobourn-Eaton types on a lot of the engines:
PJW, ASJW, AS, PJM, AC2, BA1, AA1, AB1, PHWM, AV1 LAB, PH, PJ, AVA Ser II, PCM.
Plunger on some:
PA, PAK, PAZ1, AV1 SerI.
Splash on some:
A1, AP1.
Gear on some:
PDV.
That's after a quick flick through the manuals.
Hobourn-Eaton pumps are the concentric rotor types with one lobe less on the rotor than the outer stator, which in fact rotates as well. They are widely used in power steering applications where their compact format and low parts count is a major selling point. BMC used them on the original Mini after years of gear pumps on their engines.
Regarding Nordberg, yes they had a very big machinery manufacturing side, they made all kinds of rock crushers/graders and conveyer lines etc etc.
I have a couple of contacts in the USA who have supplied me with additional engine material for the website, let me know if you want to be put in touch.
Peter