Electromagnetic switch

Claim 1

IN A DUST-PROOF SWITCH, A BASE STRUCTURE, AN UPPER STATIONARY CONTACT SUPPORT AND A LOWER STATIONARY CONTACT SUPPORT MOUNTED ON SAID BASE STRUCTURE, AN ARRAY OF UPPER STATIONARY CONTACTS AND AN ARRAY OF LOWER STATIONARY CONTACTS MOUNTED RESPECTIVELY ON SAID UPPER AND LOWER SUPPORT EXTENDING ALONG A LENGTH OF SAID SWITCH MEANS ON SAID BASE STRUCTURE MOUNTING MOVABLE CONTACTS FOR ELECTRICAL CONNECTION WITH RESPECT ONES OF SAID STATIONARY CONTACTS, ELECTROMAGNETIC MEANS HOUSED IN SAID BASE STRUCTURE FOR ACTUATING SAID MOVABLE CONTACTS, ARRAYS OF UPPER TERMINALS FOR CONNECTION TO SAID UPPER STATIONARY CONTACTS AND AN ARRAY OF LOWER TERMINALS FOR CONNECTION TO SAID LOWER STATIONARY CONTACTSDISPOSED ALONG A SIDE OF THE SWITCH THE IMPROVEMENT WHICH COMPRISES DUST-PROOF COVERS MEANS COMPRISING SAID UPPER SUPPORT HAVING PARTITIONS EXTENDING BETWEEN THE UPPER TERMINALS THE LOWER SUPPORT HAVING PARTITIONS EXTENDING BETWEEN THE LOWER TERMINALS, A TRANSPARENT COVER-PIECE HAVING SLOTS FOR RECEIVING THE PARTITIONS ON SAID UPPER SUPPORT AND SPACED RECESSES FOR RECEIVING THE PARTITIONS ON SAID LOWER SUPPORT AND EXTENDING ALONG A PART OF SAID SIDE OF THE SWITCH COMPLETELY ENCLOSING AND DEFINING A DUST-PROOF SPACE WITH SAID SUPPORTS AND BASE STRUCTURE IN WHICH SAID MOVABLE AND STATIONARY CONTACTS ARE VISIBLE FOR EXTERNALLY OF THE SWITCH FOR VIEWING THE OPERATION THEREOF.