# Relationship history for MSHA mine 4103246

Current hierarchy: **Roger  Albert → Csa Materials Inc → Cox 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

- **controller_controls_mine:** Jack  Albert  et al → Cox Pit; 1950-01-01 to 2017-01-29; source msha-controller-operator-history
- **controller_controls_mine:** Billy R  Grimmett  et al → Cox Pit; 1981-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Grimmett Brothers Inc → Cox Pit; 1984-07-01 to 1988-01-11; source msha-controller-operator-history
- **controller_controls_operator:** Billy R  Grimmett  et al → Grimmett Brothers Inc; 1984-07-01 to 1988-01-11; source msha-controller-operator-history
- **operator_operates_mine:** Csa Materials Inc → Cox Pit; 1988-01-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jack  Albert  et al → Csa Materials Inc; 1988-01-12 to 2017-01-29; source msha-controller-operator-history
- **controller_controls_mine:** Roger  Albert → Cox Pit; 2017-01-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger  Albert → Csa Materials Inc; 2017-01-30 to current/open; source msha-controller-operator-history