# Relationship history for MSHA mine 2402703

Current hierarchy: **Michael  Strahan; Kathryn  Strahan → Wolf Mountain Coal, Inc. → Wolf Mountain Coal-Spring Creek**

- 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:** Kathryn  Strahan et al → Wolf Mountain Coal-Spring Creek; 2016-01-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wolf Mountain Coal, Inc. → Wolf Mountain Coal-Spring Creek; 2016-08-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kathryn  Strahan et al → Wolf Mountain Coal, Inc.; 2016-08-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Strahan et al → Wolf Mountain Coal, Inc.; 2016-08-22 to current/open; source msha-controller-operator-history