The mathematical tools purchased in April so far...
From the Pasadena City College Swap Meet:
A 27-slot soroban abacus, the longest abacus that I have ever seen..
A 5 inch Frederick Post Co. No. 1444K slide rule.
Online:
Sharp EL-506TS (review to come soon)
Casio fx-991CW: (See review here: http://edspi31415.blogspot.com/2023/04/review-casio-fx-991cw.html
Eddie
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