# Relationship history for MSHA mine 1515099

Current hierarchy: **Smith C Y → C Y Smith Inc → No 7 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:** Payne Carl Et Al → No 7 Mine; 1977-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** P & P Coal Company → No 7 Mine; 1985-03-01 to 1987-03-09; source msha-controller-operator-history
- **controller_controls_operator:** Payne Carl Et Al → P & P Coal Company; 1985-03-01 to 1987-03-09; source msha-controller-operator-history
- **controller_controls_mine:** Smith C Y → No 7 Mine; 1986-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C Y Smith Inc → No 7 Mine; 1987-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith C Y → C Y Smith Inc; 1987-03-10 to current/open; source msha-controller-operator-history