# Relationship history for MSHA mine 4105420

Current hierarchy: **Julia  Drake; Brad  Drake → Brad Drake Construction LLC → 10040500 IRock**

- 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:** Brad Drake Construction LLC → 10040500 IRock; 2019-03-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Julia  Drake et al → 10040500 IRock; 2019-03-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Julia  Drake et al → Brad Drake Construction LLC; 2019-03-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brad  Drake et al → Brad Drake Construction LLC; 2019-03-22 to current/open; source msha-controller-operator-history