!-the_queryD010Array ( ) the_queryD0415Array ( [1] => 34357 [0] => 34434 [9] => 34444 [5] => 34498 [2] => 34515 [6] => 34525 [3] => 34548 [8] => 34622 [7] => 34647 [4] => 34655 [11] => 34756 [13] => 34760 [10] => 34769 [12] => 34784 [14] => 34801 ) the_queryD068Array ( [0] => 34662 [1] => 34558 [2] => 34741 [3] => 34735 [4] => 34714 [5] => 34690 [6] => 34693 [7] => 34686 ) historyListStrArray ( [0] => )
the_queryD00Array ( [0] => 34357 [1] => 34434 [2] => 34444 [3] => 34498 [4] => 34515 [5] => 34525 [6] => 34548 [7] => 34622 [8] => 34647 [9] => 34655 [10] => 34756 [11] => 34760 [12] => 34769 [13] => 34784 [14] => 34801 [15] => 34662 [16] => 34558 [17] => 34741 [18] => 34735 [19] => 34714 [20] => 34690 [21] => 34693 [22] => 34686 )
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The Underwriters Laboratories (UL) covers multiple areas of a buildings construction: from building inspections services and field testing of building envelopes to testing and certification of building materials.

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Standardizing power-operated doors

Power-operated doors come in a variety of designs and styles to fulfil the functions of the building envelop and interiors. Among the considerations are reliability, safe egress, accessibility, energy...
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