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Model ZA1 was the world's first commercially available autonomous vacuum cleaner. [4] The Trilobite cost around $1,500. [5] The second generation was released as Version 2.0 in 2004, model ZA2. [6] It was developed in 2003. [7]
A number of manufacturers in the cleaning industry now produce and market spray-and-vac systems or systems that are similar, and approximately 40,000–50,000 units have been sold worldwide. [citation needed] Some systems are battery operated; others do not have vacuuming capabilities however they are still classified under this product category.
[12] [10] This initial expense must be weighed against the long-term benefits of a central vacuum, including the typical longer service life of the equipment, and negligible consumables cost if a filterless system is chosen. A central vacuum system is generally considered by building owners a permanent fixture of the building where it is ...
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