# Relationship history for MSHA mine 1502782

Current hierarchy: **Richard E  Salyer → Inferno Coals Inc → No 2 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

- **operator_operates_mine:** Double O Coal Company → No 2 Mine; 1950-01-01 to 1977-05-19; source msha-controller-operator-history
- **controller_controls_mine:** Owens Victor → No 2 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Owens Victor → Double O Coal Company; 1950-01-01 to 1977-05-19; source msha-controller-operator-history
- **controller_controls_mine:** Richard E  Salyer et al → No 2 Mine; 1976-11-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Inferno Coals Inc → No 2 Mine; 1977-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard E  Salyer et al → Inferno Coals Inc; 1977-05-20 to current/open; source msha-controller-operator-history