# Relationship history for MSHA mine 1519972

Current hierarchy: **W Scott  McGeorge → Pine Bluff Materials → Dredge Percie McGeorge**

- 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:** W Scott  McGeorge et al → Dredge Percie McGeorge; 2012-03-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pine Bluff Materials → Dredge Percie McGeorge; 2024-12-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** W Scott  McGeorge et al → Pine Bluff Materials; 2024-12-19 to current/open; source msha-controller-operator-history