# Relationship history for MSHA mine 4300309

Current hierarchy: **Foster Howard C → Foster Brothers Farm Inc → Foster Brothers 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

- **controller_controls_mine:** Dwire Vernon → Foster Brothers Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Vernon Dwire-General Contractor → Foster Brothers Pit; 1979-04-01 to 1981-02-19; source msha-controller-operator-history
- **controller_controls_operator:** Dwire Vernon → Vernon Dwire-General Contractor; 1979-04-01 to 1981-02-19; source msha-controller-operator-history
- **operator_operates_mine:** Foster Brothers Farm Inc → Foster Brothers Pit; 1981-02-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Foster Howard C → Foster Brothers Pit; 1981-02-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Foster Howard C → Foster Brothers Farm Inc; 1981-02-20 to current/open; source msha-controller-operator-history