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| Part Number | H21B3 |
| Description | PHOTODARLINGTON OPTICAL INTERRUPTER SWITCH |
| Info | PHOTODARLINGTON OPTICAL INTERRUPTER SWITCH H21B1 P. |
| Manufacture | Fairchild Semiconductor |
| for PC | Download H21B3 Datasheet |
| Part Number | H21B3 |
| Description | SLOTTED OPTICAL SWITCH |
| Info | . |
| Manufacture | QT Optoelectronics |
| for PC | Download H21B3 Datasheet |