What does HEM stand for?

Historical Electronics Museum (Museum of electronics including radar, military, and microwave devices; Linthicum, Maryland)

This definition appears very rarely and is found in the following Acronym Finder categories:

Information technology (IT) and computers
Military and Government
Science, medicine, engineering, etc.
Organizations, NGOs, schools, universities, etc.

Other Resources:

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Higher Education Learning and Teaching Association of Southern Africa Helicopter Training Squadron High Energy Laser Weapons System Halk Egitimi Merkezi (Turkish: Public Education Center) Healthcare Environmental Manager Heat Exchange Method Heavy Equipment Maintenance High Energy Magic (Discworld) Higher Education Management (various schools) Historic Engineering Marker (Australia)		Hollywood Entertainment Museum Home Education Magazine Honeywell Electronic Materials (various locations) Honeywell Energy Manager (commercial building engineering) Huber Engineered Materials (Atlanta, GA) Human Epidermal Model Human Eradication Mode (TV show South Park) Human Exposure Modeling Hybrid Electromagnetic Wave Health and Environment Ministers of the Americas

Samples in periodicals archive:

TriQuint was recognized for its products and service at the NGES Supply Chain Management (SCM) and Mission Assurance (MA) 2008 Supplier Conference held at the Historical Electronics Museum in Linthicum, MD, on July 23rd, 2008.

Northrop Grumman Recognizes TriQuint with Strategic Supplier, ...