# Relationship history for MSHA mine 0501959

Current hierarchy: **Lois  Gardner; Arline M  Stewart → Whitewater Building Materials Corp → Egger Pit 501**

- 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:** Whitewater Building Materials Corp → Egger Pit 501; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lois  Gardner et al → Egger Pit 501; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lois  Gardner et al → Whitewater Building Materials Corp; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arline M  Stewart et al → Whitewater Building Materials Corp; 1950-01-01 to current/open; source msha-controller-operator-history