# Relationship history for MSHA mine 0801092

Current hierarchy: **Dickerson Group Inc → Dickerson Florida Inc → I-95 Pit**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Dickerson Group Inc → I-95 Pit; 1979-12-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dickerson Florida Inc → I-95 Pit; 1988-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dickerson Group Inc → Dickerson Florida Inc; 1988-01-01 to current/open; source msha-controller-operator-history