In “Largest screen for a smart phone” I suggesteda 4 inch screen was the largest which could be used for a easily hand held device: the size of a credit card: 85.60 × 53.98 mm (standardised as the ID-1 format). Following this approach the size for a larger, but still pocket size tablet computer would be the B7 size used for passports (ID-3 125 × 88 mm or 4.921 × 3.465 in).This would
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