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BackMm, 1x2 (see [build notes](build.md)) | | L1 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8"/>
Mm, 1x2 (see [build notes](build.md)) | | L1 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8"/>