Olivetti OFX 520 Instruction Manual page 66

Monochrome print head part numbers
Single-block print head: P/N 84431 W
Single-block print head with pigmented ink: P/N B0042 C
Rechargeable print head + 2 cartridges: P/N 52419 E
Two cartridge package: P/N 84433 S
Rechargeable print head + 4 cartridges: P/N 82070 A
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