# Relationship history for MSHA mine 1515732

Current hierarchy: **Hembree Robert → Granny Rose Coal Company → No 1 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:** J & S Coal Company → No 1 Mine; 1986-08-01 to 1987-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Stewart Jackie → No 1 Mine; 1986-08-01 to 1987-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Stewart Jackie → J & S Coal Company; 1986-08-01 to 1987-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Granny Rose Coal Company → No 1 Mine; 1987-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hembree Robert → No 1 Mine; 1987-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hembree Robert → Granny Rose Coal Company; 1987-04-01 to current/open; source msha-controller-operator-history