DESKTOP ELECTRONIC CALCULATOR – DOLPHIN 2716/19/20-12T DOL-2716 – 2COLORS 12 DIGITS TWO POWER PLASTIC KEY MEMORY PLUS M+ KEY MEMORY MINUS M- KEY PROFIT MARGIN % KEY GRAND TOTAL GT KEY DOL-2719-12T – 2COLORS 12 DIGITS TWO POWER PLASTIC KEY MEMORY PLUS M+ KEY MEMORY MINUS M- KEY PROFIT MARGIN % KEY SQUARE ROOT KEY 00 KEY RIGHT SHIFT KEY DOL-2720-12T – 2COLORS 12 DIGITS TWO POWER PLASTIC KEY MEMORY PLUS M+ KEY MEMORY MINUS M- KEY PROFIT MARGIN % KEY SQUARE ROOT KEY 00 KEY RIGHT SHIFT KEY