Note: The intercharacter interval may be of any duration. The signal sense of the intercharacter interval is always the same as the sense of the stop element, i.e. , "1" or "mark[?]."
Source: from Federal Standard 1037C and from MIL-STD-188
... perforations were officially introduced in 1854.
The stamps were printed in sheets of 240 (20 rows of 12 stamps), so one row cost 1 shilling and a compl ...
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