System-Baubrett Graupner 645 1000 x 250 x 20 mm, balsa wood, extendable. Carefully finished board squared at all sides. Sports a groove all around which fits the feathers supplied. With the aid of these dovetails two of the boards can be clipped together, providing boards of 1000 x 500 mm and 2000 x 250 mm, respectively. Still other dimensions are obtainable by adding another board or two. The top face of the board sports a grid system of squar
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