# Relationship history for MSHA mine 0101368

Current hierarchy: **Doyle Clarence--John & Lonnie Tyler → Trafford Coal Company → Gurley Creek Strip**

- 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:** Trafford Coal Company → Gurley Creek Strip; 1975-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Doyle Clarence--John & Lonnie Tyler → Gurley Creek Strip; 1975-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Doyle Clarence--John & Lonnie Tyler → Trafford Coal Company; 1975-04-01 to current/open; source msha-controller-operator-history