Morning coffee and a little time with, my ‘new’ slide rule and this manual, https://www.sliderule.ca/manual.htm thanks to @rek & @neauoire.
@rek @neauoire honourable mention to my Sharp EL-532, whose battery was been running since 1996, without change in quality.
@rek @neauoire missing features of the Sharp: water resistance, bouyancy, zero power draw. Now I understand.
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