also comprises a dustcover which covers the seam entirely preventing dust from passing through holes created when the seam is sewn using a thread or similar means application_number US 201615179614 A description this description of the exemplary embodiments is intended to be read in connection with the accompanying drawings which are to be considered part of the entire written description in the description relative terms such as u201c lower u201d u201c upper u201d u201c horizontal u201d u201c vertical u201d u201c above u201d u201c below u201d u201c up u201d u201c down u201d u201c top u201d and u201c bottom u201d as well as derivative thereof e g u201c horizontally u201d u201c downwardly u201d u201c upwardly u201d etc should be construed to refer to the orientation as then described or as shown in the drawing under discussion these relative terms are for convenience of description and do not require that the apparatus be constructed or operated in a particular orientation terms concerning attachments coupling and the like such as u201c connected u201d and u201c interconnected u201d refer to a relationship wherein structures are secured or attached to one another either directly or indirectly through intervening structures as well as both movable or rigid attachments or relationships unless expressly described otherwise reference will now be made in detail to the.