![]() ![]() On the front page of the earlier version 'N.J.' is not bracketed and 'U.S.A' is, on the later version The later version, most obvious are 'MANUFACTORIES' and 'HOUSES'. The eariler version uses some subtly different typefaces and sizes on the front page compared to ![]() ![]() The front corner decorations and matching back motif are more ornate on the earlier version, the The earlier version is slightly narrower physically, although the printing area is the same. These two versions of these instructions are from around the same time period and although the layout and texts are almost identical there are a few subtle differences: Faber's Improved Calculating Rule ( version 1 c1905-10? & version 2 c1910-12, enhanced Mannheim) ![]()
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