How to use "handling" in a sentence

Even these days, when most machines could be played with electronically validated value cards, the nickel duchesses wore black gloves to keep their hands from becoming filthy after hours of handling coins and pulling levers; they always sat on stools while they played, and they remembered to alternate hands when operating the machines in order not to strain the muscles of one arm, and they carried bottles of liniment just in case.

Elliot's mind raced through a list of cases that his law firm was currently handling, searching for some connection with these two intruders, but he couldn't think of one.

I received a death threat by phone the night before the arbitration - I can't say for certain that it was from the writer; the voice was so deep that it might have been his mother - and the next morning the law firm handling the studio's case assured me that they had taken extra security measures for the meeting