# Relationship history for MSHA mine 1504262

Current hierarchy: **Earl  Brinker → Imi-South Llc → DREDGE V**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Rogers Group Inc → DREDGE V; 1950-01-01 to 1990-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Rogers Group Inc → DREDGE V; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rogers Group Inc → Rogers Group Inc; 1950-01-01 to 1990-06-14; source msha-controller-operator-history
- **controller_controls_mine:** J B  Holeman  et al → DREDGE V; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Delta Materials Inc → DREDGE V; 1990-06-15 to 1999-03-11; source msha-controller-operator-history
- **controller_controls_operator:** J B  Holeman  et al → Delta Materials Inc; 1990-06-15 to 1999-03-11; source msha-controller-operator-history
- **operator_operates_mine:** Imi-South Llc → DREDGE V; 1999-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fred (Pete)  Irving → DREDGE V; 1999-03-12 to 2005-12-04; source msha-controller-operator-history
- **controller_controls_operator:** Fred (Pete)  Irving → Imi-South Llc; 1999-03-12 to 2005-12-04; source msha-controller-operator-history
- **controller_controls_mine:** Earl  Brinker et al → DREDGE V; 2005-12-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Earl  Brinker et al → Imi-South Llc; 2005-12-05 to current/open; source msha-controller-operator-history