Drawing from U.S.Navy, Japanese Merchant Ships Recognition Manual, ONI-208-J
| Name | 利根丸 Tone Maru |
| Ship Type | Cargo Ship |
| Launched/Completed | 1920 |
| Builder | Mitsui Bussan K. K. |
| Tonnage | 4,070 tons |
| Owner | Tamai Shosen K. K. |
| Loss Date | September 21, 1942 |
| Location | 31-18N, 123-27E |
| Circumstances | Sunk by torpedo |
| Number of Men Lost | 41 crew members |
Submarine Information
| Name of Submarine | USS Grouper (SS-214) | Patrol Number 2 |
| Commanding Officer | LCDR Rob Roy McGregor | Attack No. 329 |
Sinkings by Selected Submarines
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