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Schéma électrique interphone filaire
Source google image: https://sinisterbedfellows.com/wp-content/uploads/2018/09/gache-electrique-sans-fil-extel-interphone-leroy-merlin-interphone-filaire-scs-sentinel-3208d-leroy-lm-20bp-20local-20-20sur-20interphonie-gache-electrique-sans-fil-extel.jpg