# Relationship history for MSHA mine 1508686

Current hierarchy: **Hamby Odell → Triangle Mining Company Inc → Triangle Mine #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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Triangle D Coal Company → Triangle Mine #1; 1975-08-01 to 1981-10-21; source msha-controller-operator-history
- **controller_controls_mine:** Daniel C R → Triangle Mine #1; 1975-08-01 to 1981-10-21; source msha-controller-operator-history
- **controller_controls_operator:** Daniel C R → Triangle D Coal Company; 1975-08-01 to 1981-10-21; source msha-controller-operator-history
- **controller_controls_mine:** Hamby Odell → Triangle Mine #1; 1981-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Triangle Mining Company Inc → Triangle Mine #1; 1981-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hamby Odell → Triangle Mining Company Inc; 1981-10-22 to current/open; source msha-controller-operator-history