# Relationship history for MSHA mine 1507361

Current hierarchy: **Adkins John Jack → Riley Hall Coal Co Inc → No 12 Surface Mine**

- 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:** Adkins John Jack → No 12 Surface Mine; 1974-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Riley Hall Coal Co Inc → No 12 Surface Mine; 1974-09-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adkins John Jack → Riley Hall Coal Co Inc; 1974-09-30 to current/open; source msha-controller-operator-history