Section 602 - Certification required1. On and after July first, two thousand six, no person or business entity shall manufacture, including the manufacture outside the state of New York for sale into the state of New York, sell, install or service any manufactured home in the state of New York, unless such person or business entity has obtained the appropriate certification from the department pursuant to this article.2. On and after July first, two thousand six, no manufactured home shall be installed or serviced unless at least one person certified by the department to perform such work is present at the home site during the installation or service.3.a. Each manufacturing plant that delivers or sells manufactured homes in this state, each retail sales location and each business entity selling, installing or performing service on manufactured homes must be separately certified.b. Each manufacturer, retailer, installer and mechanic shall employ at least one person who has been certified by the department.4. Manufacturers approved to construct manufactured homes by the United States department of housing and urban development shall be required to apply for, and obtain, certification pursuant to this article. Any such manufacturer shall be deemed to meet the requirements for certification under this article, except that the department may, after a hearing, suspend or revoke the certification of any manufacturer as provided in subdivision seven of section six hundred four of this article.