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].
Lunch counter. A lunch counter (also known as a luncheonette) is a small restaurant, much like a diner, where the patron sits on a stool on one side of the counter and the server or person preparing the food serves from the other side of the counter, where the kitchen or limited food preparation area is.