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].
Post-Formed (PF) Post-formed counters represent the most popular (and economical) type of kitchen counter. They feature a rolled edge construction available in European roll, No-drip, Waterfall, 180 Degree Wrap, Valencia, Barcelona, and Geneva designs (see edge profiles below).