Elling Holst is not a widely recognized name or term in general knowledge or popular culture as of my last update. It's possible that it could refer to a person, a brand, or a term that has emerged more recently.

Emil Spjøtvoll is a Norwegian entrepreneur known for his involvement in the technology and software development sectors. He has garnered attention for his work in various startups and initiatives. However, it is worth noting that specific details about his contributions or roles may not be widely documented or available in public sources.

As of my last update in October 2023, there is no widely known public figure, entity, or concept named Kristian Seip. It's possible that this name refers to a private individual or a lesser-known figure in a specific field.

Ole Michael Ludvigsen Selberg is a name that does not appear to be widely known or associated with any notable public figure as of my last knowledge update in October 2023. It's possible that he could be a private individual or a person who has gained recognition after my last update.

Lars Vegard is a name associated with a concept in materials science known as the Vegard's Law. This law describes the linear relationship between the composition of an alloy and its lattice constants, which is significant in understanding the physical properties of solid solutions. Specifically, Vegard's Law states that the lattice parameter of a solid solution can be calculated as a weighted average of the lattice parameters of the constituent pure components.

As of my last knowledge update in October 2021, Leiv Harang does not appear to be a widely recognized name or term in public domains, literature, or well-known contexts. It could refer to a person, brand, or a term that has emerged after that date or might be more niche.

An economizer is a mechanical device or system used to improve energy efficiency in various applications, particularly in heating, ventilation, and air conditioning (HVAC) systems, as well as in industrial processes. Its primary function is to minimize energy consumption and reduce operational costs by recovering and reusing waste heat or optimizing the use of available energy resources.