# Relationship history for MSHA mine 1513233

Current hierarchy: **TECO Energy Inc → Gatliff Coal Company Inc → Royal Gem**

- 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:** TECO Energy Inc → Royal Gem; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rice Carl H → Royal Gem; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cardinal Resources Inc → Royal Gem; 1978-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cardinal Resources Inc → Royal Gem; 1981-11-01 to 1983-08-25; source msha-controller-operator-history
- **controller_controls_operator:** Cardinal Resources Inc → Cardinal Resources Inc; 1981-11-01 to 1983-08-25; source msha-controller-operator-history
- **operator_operates_mine:** Royal Gem Coal Company → Royal Gem; 1983-08-26 to 1991-03-13; source msha-controller-operator-history
- **controller_controls_operator:** Rice Carl H → Royal Gem Coal Company; 1983-08-26 to 1991-03-13; source msha-controller-operator-history
- **operator_operates_mine:** Gatliff Coal Company Inc → Royal Gem; 1991-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** TECO Energy Inc → Gatliff Coal Company Inc; 1991-03-14 to current/open; source msha-controller-operator-history