# Relationship history for MSHA mine 3603634

Current hierarchy: **Ettari Paul D → Dexter Carpenter Coal Sales Corp → Dexter #1**

- 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:** Cambria Mills Coal Company Inc → Dexter #1; 1950-01-01 to 1979-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Apple T Merle → Dexter #1; 1950-01-01 to 1979-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Apple T Merle → Cambria Mills Coal Company Inc; 1950-01-01 to 1979-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Cambria Mills Coal Company Inc → Dexter #1; 1980-01-01 to 1992-09-07; source msha-controller-operator-history
- **controller_controls_mine:** Dotts Frank J → Dexter #1; 1980-01-01 to 1992-09-07; source msha-controller-operator-history
- **controller_controls_operator:** Dotts Frank J → Cambria Mills Coal Company Inc; 1980-01-01 to 1992-09-07; source msha-controller-operator-history
- **operator_operates_mine:** Dexter Carpenter Coal Sales Corp → Dexter #1; 1992-09-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ettari Paul D → Dexter #1; 1992-09-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ettari Paul D → Dexter Carpenter Coal Sales Corp; 1992-09-08 to current/open; source msha-controller-operator-history