Day & Zimmermann — independent third-party profile of a public API surface, by API Evangelist. Day & Zimmermann is a privately held, family-owned diversified industrial services company founded in 1901 and headquartered in Philadelphia, Pennsylvania. The company operates across four primary business segments — Maintenance & Construction (power, nuc
construction power maintenance staffing defense engineering-services workforce-solutions ammunition apis-json government-services architecture-and-engineering industrial-services nuclear-services munitions
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Updated
Sep 4, 2026