P0 series (1960 to 1968) Previous
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When Sangamo introduced the J3 singlephase meter with magnetic bearing in 1960, the P line of polyphase meters was also reintroduced with a magnetic bearing. To designate the changeover from jewel to magnetic bearings, a zero was added to the model number - i.e., the P2SY became the P20SY etc. In all other respects, the P0 line of meters was identical to the previous P line. P0 polyphase
Sangamo meter handbook