Random triples
| Subject | Object |
|---|---|
| gptkb:U-boat_campaign_in_the_North_Atlantic | improved anti-submarine weapons |
| gptkb:U-boat_campaign_in_the_North_Atlantic | convoy system |
| gptkb:U-boat_campaign_in_the_North_Atlantic | escort carriers |
| gptkb:U-boat_campaign_in_the_North_Atlantic | Ultra intelligence |
| gptkb:U-boat_campaign_in_the_North_Atlantic | long-range patrol aircraft |