# Relationship history for MSHA mine 4801762

Current hierarchy: **Michael  Strahan; Kathryn  Strahan → Wolf Mountain Coal, Inc. → WMC- Industrial Road Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Robert  Mullinax → WMC- Industrial Road Plant; 1950-01-01 to 2025-04-20; source msha-controller-operator-history
- **operator_operates_mine:** Mullinax Concrete Service Co. → WMC- Industrial Road Plant; 2012-01-19 to 2016-01-03; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Mullinax → Mullinax Concrete Service Co.; 2012-01-19 to 2016-01-03; source msha-controller-operator-history
- **operator_operates_mine:** Wolf Mountain Coal, Inc. → WMC- Industrial Road Plant; 2016-01-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kathryn  Strahan et al → WMC- Industrial Road Plant; 2016-01-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kathryn  Strahan et al → Wolf Mountain Coal, Inc.; 2016-01-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Strahan et al → Wolf Mountain Coal, Inc.; 2016-01-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nathan  Mullinax → WMC- Industrial Road Plant; 2025-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nathan  Mullinax → Mullinax Concrete Service Co.; 2025-04-21 to 2016-01-03; source msha-controller-operator-history