What does MMH/OH stand for?

Maintenance Manhours Per Operating Hour

This definition appears very rarely

Other Resources:

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Morristown Memorial Hospital (Morristown, New Jersey) Moving Mesh Hydrodynamic (algorithm) Multilinear Modular Hash Multimedia Mail Handler Michigan Manufactured Housing, RV and Campground Association (also seen as MMHRVCA) Maintenance Manhours Per Flying Hour Maintenance Manhours per Flying Hour (aircraft operations) Mean Manhours Per Flight Hour Mean Man Hours per Flight Hour-Design Controllable Mean Manhours Per Maintenance Action		Mean Manhours Per Processed Hour Millimeters of Water (unit of pressure) Massachusetts Manufactured Housing Association, Inc. Michigan Manufactured Housing Association Minnesota Manufactured Housing Association Minnesota Multi Housing Association (also seen as MHA; est. 1967; trade association) Mississippi Manufactured Housing Association Missouri Manufactured Housing Association Multicultural Mental Health Australia (Australian Department of Health and Ageing) Mangalarga Marchador Horse Association of America (humane breed association)