J2F switchboard (1954 to 1960), PxF switchboard (1957 to 1960) Previous
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The J2F meter was a transformer-rated version of the J2 singlephase meter in a semi-flush switchboard-mount case.

As with the J2F, the PxF was also the switchboard version of the Px series of polyphase meters (no picture yet).

J2F switchboard
Electrical Metermen's Handbook