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Light Curtain Safety Grating 4 Points 40mm Safety Light Curtain Sensor Switch Photoelectric Protection Device - Switches - AliExpress
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Amazon.com: Light Curtain Sensor Switch Safety Light Grating Security Device 24VDC BEM0640-30NB NPN-NC Beams 6 Optical Axis Spacing 40mm/1.6in with Grating Receiver and Cable : Automotive
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