# Relationship history for MSHA mine 2902065

Current hierarchy: **Royce C  Morton; Edna O  Morton → Big Chief Stone Inc → Bagging 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:** Edna O  Morton  et al → Bagging Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big Chief Stone Inc → Bagging Plant; 1990-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edna O  Morton  et al → Big Chief Stone Inc; 1990-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Royce C  Morton  et al → Big Chief Stone Inc; 1990-11-01 to current/open; source msha-controller-operator-history