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Dear Mr. Hosmer,
Thank you for posting your request on History Hub!
We searched the internet and located an obituary for Charles Maloney Dies, Founder of Concrete Firm and a court case Miller v. Maloney Concrete Co. that may be helpful in developing a history of the Mahoney Concrete Company in Bethesda, MD. Also if any of the business records still exist, please contact the family members listed in the obituary or contact the Bethesda Historical Society and the Maryland State Archives.
We hope this is helpful. Best of luck with your research!