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[SOLVED] Help identify component

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peterpops

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Hi Edaboard

I have four components on a PCB controlling a Pneumatic valve

unknown.PNG

Two of them have text according the picture

The other too look the same but with the text (my interpretation)
Top row: SU4 or S U4
Mid row: 355
Bot row: Same except letter C

Best regards
Peter
 

davoud

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peterpops

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