.....This T-square is like the one Vern used in the 1950's and 1960's, when it was required.

When drawing schematics Vern did use the T-square with the lettering guide and Triangle shown left.
Click on photo
Vern in 1961 - Manitou Beach
Above he is drawing staking sheets
......The Telephone Template left is still for sale in the 21st century. In 1961, Vern had a small one with just triangles and circles when drawing staking sheets as depicted in photo link above.

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