Ventilators are typically used by ALS patients having difficulty breathing. There are several kinds of non-invasive ventilators, such as small devices that fit over the nose and mouth. Patients may also opt for a tracheostomy, a surgical procedure in which a tube is placed into the throat.
3. Counters. A counter is a digital sequential logic device that will go through a certain predefined states (for example counting up or down) based on the application of the input pulses. They are utilized in almost all computers and digital electronics systems [1].
counter check-a blank check provided by a bank for the convenience of customers who are making withdrawals.bank check, check, cheque-a written order directing a bank to pay money; he paid all his bills by check.ounter check-a blank check provided by a bank for the convenience of customers who are making withdrawals.