Going back to the early 1960s I remember the slide rules hung like six-guns on belts (I had a pocket sized one that had its own leather case with a clip on it to hold it in my shirt pocket) and plastic pocket protectors because the ball point pens leaked in those days. Most engineers could be identified at first sight. Short sleeved white shirts, thin dark neckties.
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"No one is more hated than he who speaks the truth." Plato
“To argue with a person who has renounced the use of reason is like administering medicine to the dead.” Thomas Paine
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