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H21B4 series datasheets. Manufacturer: QT.

H21B4Photodarlington Optical Interrupter Switche with Tabs/Gap Width=3.15 mmDatasheet*)
H21B5Photodarlington Optical Interrupter Switche with Tabs/Gap Width=3.15 mmDatasheet*)
H21B6Photodarlington Optical Interrupter Switche with Tabs/Gap Width=3.15 mmDatasheet*)
There are other manufacturers for this components. For more information please check
H21B4 (Fairchild Semiconductor)
H21B4 (GESS)
H21B4 (ISOCM)
Click here to download H21B4 Datasheet
Click here to download Datasheet
*)

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