# Relationship history for MSHA mine 2900479

Current hierarchy: **Constructors Inc (NM) → Rose Gravel Company → Hidalgo 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Rose Gravel Company → Hidalgo Plant; 1950-01-01 to 1991-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Rose Joe & A L → Hidalgo Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rose Joe & A L → Rose Gravel Company; 1950-01-01 to 1991-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Rose Gravel Company → Hidalgo Plant; 1991-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Constructors Inc (NM) → Hidalgo Plant; 1991-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Constructors Inc (NM) → Rose Gravel Company; 1991-04-01 to current/open; source msha-controller-operator-history