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Philips 8051Fujitsu microprocessors
AMD Fujitsu
Intel P8051AH OKI M80C51-57
Siemens Signetics SCN8051H CCN40 / SCN8051HCCN40
USSR KR1816VE51

Philips 8051Fujitsu microprocessors
Fujitsu MBL8051AHC / MBL8051AH (ceramic) Fujitsu MBL8051AHP / MBL8051AH (plastic)

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