β 41 (12-19.10.07.)
π Magazine
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2007
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Machine Design 1969-07-10: <a href="https://archive.org/search.php?query=sim_pubid%3A1075%20AND%20volume%3A41" rel="nofollow">Volume 41</a>, Issue 16.<br />Digitized from <a href="https://archive.org/details/sim_raw_scan_IA1641832-02/page/n754" rel="nofollow">IA1641832-02</a>.<br />Previous issue: <