# Relationship history for MSHA mine 1516215

Current hierarchy: **Hembree Robert → Granny Rose Coal Company → 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

- **controller_controls_mine:** Hembree Robert → No 2 Mine; 1987-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** M & G Coal Company → No 2 Mine; 1987-10-01 to 1988-01-19; source msha-controller-operator-history
- **controller_controls_mine:** Mc Donald Jess Et Al → No 2 Mine; 1987-10-01 to 1988-01-19; source msha-controller-operator-history
- **controller_controls_operator:** Mc Donald Jess Et Al → M & G Coal Company; 1987-10-01 to 1988-01-19; source msha-controller-operator-history
- **operator_operates_mine:** Granny Rose Coal Company → No 2 Mine; 1988-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hembree Robert → Granny Rose Coal Company; 1988-01-20 to current/open; source msha-controller-operator-history