My speculation says this was a product manufactured by BT- Prime Mover and sold to Clark as an OP15X. The BT Prime Mover name was OE35 or OE35X. The BT Prime Mover name soon disappeared when Toyota bought BT, BT-Prime Mover and Raymond. I Believe the BT-PrimeMover plant builds products for the Raymond brand maybe some for big daddy Toyota too - not certain.
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