# Relationship history for MSHA mine 3605676

Current hierarchy: **Kerry L  Mears → Mears Enterprises Inc → Dixon Run No 6**

- 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:** Zapata Corp → Dixon Run No 6; 1974-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mears Coal Company → Dixon Run No 6; 1975-01-01 to 1976-10-01; source msha-controller-operator-history
- **controller_controls_operator:** Zapata Corp → Mears Coal Company; 1975-01-01 to 1976-10-01; source msha-controller-operator-history
- **operator_operates_mine:** Dixonville Mining Company → Dixon Run No 6; 1976-10-02 to 1980-01-30; source msha-controller-operator-history
- **controller_controls_mine:** Kephart Gerald A Jr Et Al → Dixon Run No 6; 1976-10-02 to 1980-01-30; source msha-controller-operator-history
- **controller_controls_operator:** Kephart Gerald A Jr Et Al → Dixonville Mining Company; 1976-10-02 to 1980-01-30; source msha-controller-operator-history
- **operator_operates_mine:** Mears Enterprises Inc → Dixon Run No 6; 1980-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kerry L  Mears → Dixon Run No 6; 1980-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kerry L  Mears → Mears Enterprises Inc; 1980-01-31 to current/open; source msha-controller-operator-history