Quick note on patent describing character rounding technique.

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@@ -489,6 +489,9 @@ U+2590 RIGHT HALF BLOCK
 ITU-T Recommendation T.100 is another standard that encodes 6-cell
 mosaic graphics.
 
+UK patent number 1343298 (filed 1971 by Mullard) describes the
+character rounding technique used by the SAA5050.
+
 FontForge's "Expand stroke" may be useful for converting single-line
 font into something useful.  A 50-unit circular pen generates Bedstead
 Plotter.  A 100×50-unit, 20° rectangular pen generates a surprisingly