# Relationship history for MSHA mine 1508526

Current hierarchy: **Kinser G C Jr & Allen R Madden → M K M Coal Inc → Hemphill Fuel Co Surface**

- 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:** Kinser G C Jr & Allen R Madden → Hemphill Fuel Co Surface; 1975-05-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** M K M Coal Inc → Hemphill Fuel Co Surface; 1975-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kinser G C Jr & Allen R Madden → M K M Coal Inc; 1975-07-01 to current/open; source msha-controller-operator-history