| 摘要 |
The object of the invention is to create jobs, save energy and heating costs and provide an additional room. The manufacturer has to cooperate with the housing-construction companies. Everything is manufactured in accordance with DIN + standard. The manufacturer and the housing-construction companies are responsible for the subsequent installation. The price is based on the quality and has to be set such that allowance is made for the service life, i.e. the service life has to be restricted in order to permit demand. Demand = jobs.
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