# Relationship history for MSHA mine 0404369

Current hierarchy: **Atlantic Richfield Company → Anaconda Minerals Company → Ash Meadows Pit & 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:** Atlantic Richfield Company → Ash Meadows Pit & Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rook & Messer Excavating Company → Ash Meadows Pit & Plant; 1979-12-01 to 1980-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Messer Luvon → Ash Meadows Pit & Plant; 1979-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Messer Luvon → Rook & Messer Excavating Company; 1979-12-01 to 1980-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Anaconda Minerals Company → Ash Meadows Pit & Plant; 1980-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Atlantic Richfield Company → Anaconda Minerals Company; 1980-05-01 to current/open; source msha-controller-operator-history