📁 proc/18/root/sys/devices/pnp0/00:00/00:00:0/firmware_node/physical_node1/subsystem

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📁 / / proc / 18 / root / sys / devices / pnp0 / 00:00 / 00:00:0 / firmware_node / physical_node1 / subsystem

📍 /sys/bus/serial-base