Check the listing for details. 1963 ~ James G Biddle ~ Grounding Principles 25T4 + other Grounding Bulletins. Condition: Like New. Listed at 24.99 USD. 1963 James G Biddle Bulletin 25T4 - Grounding Principles and Practices As Applied to Industrial Plants - by E.B Curdts + Bulletin 25T2 - Grounding Electric Circuits Effectively - by J. R Eaton + Bulletin 25P1 - How Good are Your System Grounds? Comes form a former missile engineer for the US Air Force.Was employed under this position during 1950's and 1960's, may have continued on afterwards, all the paperwork I have are from that period. Superb condition. Well cared for. pages are clean and crisp. Looks like it could have been printed recently not 60 years ago.1 catalog a little worn around the edges. Airpax Corporation was founded in 1947 in Baltimore, Maryland, and was purchased by North American Phillips Corporation in the 1970s. It was purchased by management and Industrial Growth Partners, a private equity firm, in 1999 and by management, Chicago Growth Partners, and Norwest Equity Partners in 2004.