Standard ACCESSORY ENVELOPE TYPE XII FOR 6 1/2" NOMINAL DIAMETER GENERATORS 1958-07-15 CURRENT ARP550A
Standard ACCESSORY ENVELOPE TYPE XVI FOR 11" NOMINAL DIAMETER GENERATORS AC OR DC ABOVE 60 KVA (TYPE I & II) 1958-07-15 CURRENT ARP553A
Standard ACCESSORY ENVELOPE TYPE XVI FOR 11" NOMINAL DIAMETER GENERATORS AC OR DC 15 TO 60 KVA (TYPE I & II) 1958-07-15 CURRENT ARP552A