# Relationship history for MSHA mine 4100315

Current hierarchy: **Boswell Kent → Comanche County Mining Company Inc → Comanche County Pit**

- 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:** Wes-Tex Clay Products Company → Comanche County Pit; 1950-01-01 to 1978-07-30; source msha-controller-operator-history
- **controller_controls_mine:** Wes-Tex Clay Products Company → Comanche County Pit; 1950-01-01 to 1978-07-30; source msha-controller-operator-history
- **controller_controls_operator:** Wes-Tex Clay Products Company → Wes-Tex Clay Products Company; 1950-01-01 to 1978-07-30; source msha-controller-operator-history
- **operator_operates_mine:** De Leon Brick Works Inc → Comanche County Pit; 1978-07-31 to 1983-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Ricker Larry G → Comanche County Pit; 1978-07-31 to 1983-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Ricker Larry G → De Leon Brick Works Inc; 1978-07-31 to 1983-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Comanche County Mining Company Inc → Comanche County Pit; 1983-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Boswell Kent → Comanche County Pit; 1983-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Boswell Kent → Comanche County Mining Company Inc; 1983-09-01 to current/open; source msha-controller-operator-history