BRAND^®計算盤BLAUBRAND^® Neubauer改良タイプ

BRAND^®計算盤BLAUBRAND^® Neubauer改良タイプ, without clips, bright-line

BRAND^®計算盤BLAUBRAND^® Neubauer改良タイプ, without clips, double ruled

BRAND^®計算盤BLAUBRAND^® Neubauer改良タイプ, with clips, double ruled