# Relationship history for MSHA mine 1515673

Current hierarchy: **Middleton Darrell → Lisa Anthony Coal Company 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Charles  Turner → No 2; 1985-07-01 to 1993-04-04; source msha-controller-operator-history
- **operator_operates_mine:** Tom Coal Company Inc → No 2; 1986-06-01 to 1991-12-26; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Turner → Tom Coal Company Inc; 1986-06-01 to 1991-12-26; source msha-controller-operator-history
- **controller_controls_mine:** Middleton Darrell Et Al → No 2; 1987-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lisa Anthony Coal Company Inc → No 2; 1991-12-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Middleton Darrell Et Al → Lisa Anthony Coal Company Inc; 1991-12-27 to current/open; source msha-controller-operator-history