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| Army designation: | OP-S 21 |
| Code Name: | Na cvicisti |
| Type: | intermediate infantry casemate |
| Resistance Class: | II |
| Armament left side | Armament right side |
| L1 | M | - | M | L1 | - |
| Domes or cupolas from left to right |
| ZN | - | - | ZN | Legend |
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| Status in 1938: | |
| Current status: | closed |
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| Latitude: | N49 57.349' |
| Longitude: | E17 52.553' |
| Map link: | GoogleMaps |
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