What does OBH stand for?

Office Busy Hour - Telecommunications (TEL)

Oh Bloody Hell (XSAL)

Oil Bath Heater

Old Berkeley Hunt - British

Old Berkshire Hounds - British

Old Highland Blend - Whisky (ROG)

Operational Biomedical Harness

Orestes Boat Builder & Repair, Miami, FL - Manufacturer code for watercraft hull identification number (USCG)

Wolbach, NE - Location identifier - FAA (FAAL)