# Relationship history for MSHA mine 3603532

Current hierarchy: **Ferris Theresa A → Ferris Coal Company Inc → Enon Valley**

- 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:** Ferris Theresa A → Enon Valley; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Thompson Mining Company → Enon Valley; 1950-01-01 to 1988-04-06; source msha-controller-operator-history
- **controller_controls_mine:** Louisville Cement Company → Enon Valley; 1950-01-01 to 1988-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Louisville Cement Company → Thompson Mining Company; 1950-01-01 to 1988-04-06; source msha-controller-operator-history
- **operator_operates_mine:** Ferris Coal Company Inc → Enon Valley; 1988-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ferris Theresa A → Ferris Coal Company Inc; 1988-04-07 to current/open; source msha-controller-operator-history