WHAT DOES SM6 SCHNEIDER MEAN?

According to historic texts, the inch was first recognized inside the 7th century as a means of examining wound depth. Its first Formal definition dates from 1324 – a few grains of barley, dry and round, put conclusion to end, lengthwiseRecord/origin: The expression "inch" was derived in the Latin device "uncia" which equated to "a single-twelfth