For 10 points, name these devices used by retail employees to make change.
The founder of a prominent company named for these devices once ordered that a fired employee's desk chair be brought outside the building and set on fire, and he frequently fired and re-hired future GM exec Charles Kettering.  Steel replaced brass in these devices following a brass shortage in World War I.  John Henry Patterson headed a company named for them.  While on a vacation cruise, saloon owner James Ritty was inspired by the propellers of a steam engine to invent an "incorruptible" machine of this type.  A company that made these machines proposed the (*) NCR variant of DOS and made machines that produced a journal for record keeping.  These devices are often connected to computers in POS terminals.  The drawer on modern examples of these devices can be opened by hitting the "No Sale" button.  For 10 points, name these devices used by retail employees to make change.
The founder of a prominent company named for these devices once ordered that a fired employee's desk chair be brought outside the building and set on fire, and he frequently fired and re-hired future GM exec Charles Kettering.  
cash registers [or till; prompt on POS terminals or Point of Sale terminals before mentioned]