In 1955, the Pizza Hut restaurant was first commenced. Its first logo featured its only mascot Pete holding the words Pizza and Hut. 1967â1999. In 1967, the chain began using a new and simplified logo featuring the now-famous red roof design (which is still used albeit in a modified form today).
Oxygen therapy can be delivered using a low flow or high flow system. All high flow systems require humidification. The type of humidification device selected will depend on the oxygen delivery system in use, and the patient's requirements. The humidifier should always be placed at a level below the patient's head.
1 A fixed-pulse device can deliver oxygen at a set rate with each breath. 2  Or it can be set to skip one or more breaths. 3  A demand-pulse device can deliver oxygen throughout the breathing in phase or only during a part of the phase. 4  This device is capable of adjusting to changes in demand.