# Relationship history for MSHA mine 4201702

Current hierarchy: **Brenda  Land; Sid J  Greehey → Edgewater Petroleum Inc → Queen Of Sheba**

- 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:** Edgewater Petroleum Inc → Queen Of Sheba; 1980-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brenda  Land  et al → Queen Of Sheba; 1980-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brenda  Land  et al → Edgewater Petroleum Inc; 1980-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sid J  Greehey  et al → Edgewater Petroleum Inc; 1980-08-01 to current/open; source msha-controller-operator-history