RELAXATION STRUCTURE OF LEVEL DIFFERENCE, RELAXATION METHOD OF LEVEL DIFFERENCE, AND BLOCK FOR LEVEL DIFFERENCE RELAXATION 段差の緩和構造、段差の緩和方法、段差緩和用ブロック - 特許庁
AUXILIARY HANDRAIL FOR LEVEL DIFFERENCE 段差用補助手摺 - 特許庁
Copyright (c) 2001 Robert Kiesling. Copyright (c) 2002, 2003 David Merrill. The contents of this document are licensed under the GNU Free Documentation License. Copyright (C) 1999 JM Project All rights reserved.