| English | Japanese |
| n duplicate key | 合鍵 |
| n duplicate key | 合かぎ |
| n duplicate key | 合い鍵 |
| n duplicate pair | 二通り news2 nf28 |
| n duplicate sample | 控え見本 (ひかえみほん) |
| duplicate service | ２回線受電 |
| n duplicate stitch | メリヤス刺繍 |
| in duplicate | 繰り返して |
| in duplicate | 二通り |
| in duplicate | 複製して |
| n original and duplicate | 正副二通 |