# Relationship history for MSHA mine 4404170

Current hierarchy: **Billiter Jim → Hard Times Mining Inc → No 2**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Shortridge Keaster Et Al → No 2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Q & G Coal Company Inc → No 2; 1975-11-25 to 1980-04-17; source msha-controller-operator-history
- **controller_controls_operator:** Shortridge Keaster Et Al → Q & G Coal Company Inc; 1975-11-25 to 1980-04-17; source msha-controller-operator-history
- **controller_controls_mine:** Billiter Jim → No 2; 1979-02-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hard Times Mining Inc → No 2; 1980-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Billiter Jim → Hard Times Mining Inc; 1980-04-18 to current/open; source msha-controller-operator-history