Commercial refrigerator and freezer units were in use for almost 40 years prior to the common home models. The freezer on top and refrigeratorb on bottom style has been the basic style since the 1940s, until modern refrigerators broke the trend. A vapor compression cycle is used in most household refrigerators, refrigerator freezers and freezers. Newer refrigerators may include automatic defrosting, chilled water, and ice from a dispenser in the door.The great variety of spare parts poses the biggest challenge, since the availability of parts.process reliability have to be guaranteed.This can be accomplished through accurate and timely delivery either through preventative maintenance measures or in case of emergencies.The great variety of spare parts poses the biggest challenge, since the availability of parts.process reliability have to be guaranteed.This can be accomplished through accurate and timely delivery either through preventative maintenance measures or in case of emergencies. Name: Guflam mob# 0506484707