Three-Fold, Five-Element. In The Open State, The Dimensions Of The Board Are Not Less Than 1000 Mm X 3000 Mm. The Size Of The Side Sashes Is Not Less Than 1000 Mm X 745 Mm, The Central One Is Not Less Than 1000 Mm X 1500 Mm. The Distance Between The Sashes Is Not More Than 5 Mm. In The Closed State, The Dimensions Of The Board Are Not Less Than 1000 Mm X 1500 Mm. Three Leaves Are Chalky. The Back Side Of The Two Side Flaps Is For A Marker. The Working Surface For Chalk Has A Dark Green Color, And The Marker Surface Is White. The Main Part Of The Board Is One-Sided Chalk, The Rear Non-Working Surface Is Galvanized. Rotating Elements Of The Boards Are Two-Sided, On One Side - Chalk, On The Other - Marker. The Canvas Of The Board Should Consist Of Two Layers Of The Gesture, Between The Layers Of The Gesture There Should Be A Filler (Double-Corrugated Cardboard Or Similar Material). The Steel Base Of The Facing Sheet Should Make It Possible To Attach Visual Aids To The Surface Of The Board With The Help Of Magnets. The Thickness Of The Board Is Not Less Than 10 Mm. Fasteners For The Main And Additional Surfaces - Metal, Hinged, Withstand A Load Not Less Than Twice The Weight Of The Board. The Edges Of The Board Must Have A Metal Edging With Plastic Corners, Fastened By Means Of A Groove Connection. The Width Of The Edging Is Not Less Than 18 Mm. The Connection Of The Main Surface With The Edging Must Be Riveted. Along The Lower Edge There Should Be A Tray For Chalk Dust Or A Marker, Made Of A Steel Sheet With Side Plastic Plugs., 117,857.14, 117,857.14
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