# Relationship history for MSHA mine 1001819

Current hierarchy: **Ernest W Johnson; Robert E  Johnson → MOUNTAIN WEST, LLC → Moonstone Pit**

- 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

- **operator_operates_mine:** Mountain West Bark Products Inc → Moonstone Pit; 1988-02-01 to 2008-07-29; source msha-controller-operator-history
- **controller_controls_mine:** Frank  Daniels et al → Moonstone Pit; 1988-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank  Daniels et al → Mountain West Bark Products Inc; 1988-02-01 to 2008-07-29; source msha-controller-operator-history
- **controller_controls_operator:** Gerald  Taylor et al → Mountain West Bark Products Inc; 1988-02-01 to 2008-07-29; source msha-controller-operator-history
- **controller_controls_mine:** Robert E  Johnson et al → Moonstone Pit; 2000-03-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** MOUNTAIN WEST, LLC → Moonstone Pit; 2008-07-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert E  Johnson et al → MOUNTAIN WEST, LLC; 2008-07-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ernest W Johnson et al → MOUNTAIN WEST, LLC; 2008-07-30 to current/open; source msha-controller-operator-history