The OBS = Omni Bearing Selector
To "observe" or visualize.
'obs.' when used in defining terms in a dictionary stands for 'obsolete', and indicates a lesser known or rarely utilized meaning for the term.
Cotton depleted the soil in the American South in the 1800's, if that is what you mean.
Obs Heximer died in 1988.
Obs Heximer was born in 1910.
OBS Logistics was created in 1989.
A battery that has lost it's charge.
OBS - South Korean broadcaster - was created in 1990.
The flow concept is the one in which goods and services move from person to person. In the stock concept, stocks build up or get depleted, they do not flow.
A residential smoke alarm must be at least 75 dBA, or 15 dBA above average ambient sound (whichever is greater), measured at pillow location, meaning that it may be much louder at the source. In a "high ambient noise area" it must be 110 dBA.
Deplete means to get over. Ozone is getting depleted.