Linde dusted off his 1961 dated (1960 pub.) Gun Digest - the 15th Anniversary DeLuxe Edition - and found the same information in the company name appendix.

J. M. Bucheimer Co (Frederick, Maryland)

Bucheimer-Clark Corp, 6314 S. Broadway, Los Angeles 3, California.

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I did a simple search for California corporation records.
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| California Secretary of State

C0368363 BUCHEIMER-CLARK CORP.

Registration 2-5-1959 Dissolution 3-5-1970
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Bucheimer - Clark J. M. Bucheimer Company - Company Profile

J. M. Bucheimer Company, Which Will Do Business In California As Bucheimer - Clark filed as a Statement & Designation By Foreign Corporation in the State of California and is no longer active. This corporate entity was filed on Thursday, April 9, 1970 , according to public records filed with California Secretary of State.