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S-D Struthers-Dunn, Inc Slide Ruler & Case w/ Vintage Pickett & Eckel Guide D09
$14.70
Slide rule small 5" plastic ruler Struthers Dunn Inc. , Pre-owned.
$11.99
1945 AD(J26)~STRUTHERS-DUNN INC. PHIL., PA. VACUUM RELAY SWITCH FOR AIRCRAFT
$7.49
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