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I worked at AiResearch with the Apollo engineers. They spent years calculating by hand and made tables out to four and five significant digits of different commonly used calculations. All they had to do was look up. The HP-35 calculator changed all that in days. Amazing transition period.
The Holey-Moley Digger can be used to dig straight, uniform, deep 6" to 8.5" holes for cache tubes using a shop vac. Comes in do it yourself kit. Http:/www.holeymoleydigger.com