# Relationship history for MSHA mine 3401317

Current hierarchy: **Public Service Co Of New Mexico → Transwestern Mining Company → Heavener #1**

- 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

- **controller_controls_mine:** Turner Charles Richard-William Tom Turner Et Al → Heavener #1; 1980-10-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Turner Brothers Inc → Heavener #1; 1981-04-01 to 1986-07-18; source msha-controller-operator-history
- **controller_controls_operator:** Turner Charles Richard-William Tom Turner Et Al → Turner Brothers Inc; 1981-04-01 to 1986-07-18; source msha-controller-operator-history
- **controller_controls_mine:** Public Service Co Of New Mexico → Heavener #1; 1986-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Transwestern Mining Company → Heavener #1; 1986-07-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Public Service Co Of New Mexico → Transwestern Mining Company; 1986-07-19 to current/open; source msha-controller-operator-history