Tangentially related to Clearview/"Highway Gothic": the article writes "An attempt to update the 75 year old typeface resulted in the 2003 release of a new font

Tangentially related to Clearview/"Highway Gothic": the article writes "An attempt to update the 75 year old typeface resulted in the 2003 release of a new font named Clearview" - but then it shows some scans from the 1937 manual and the font is definitely _not_ Highway Gothic (the letters look much boxier, probably because they were designed to be painted by hand). So when was "Highway Gothic" actually introduced?