# Relationship history for MSHA mine 1516881

Current hierarchy: **Bill J  Collett → R V Mining Company Inc → #16 Auger**

- 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:** Bill J  Collett et al → #16 Auger; 1986-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R V Mining Company Inc → #16 Auger; 1990-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill J  Collett et al → R V Mining Company Inc; 1990-05-01 to current/open; source msha-controller-operator-history