# Relationship history for MSHA mine 3401171

Current hierarchy: **Gonzales Phillip → Gonzales Sand Company → Gonzales 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Gonzales Sand Company → Gonzales Pit; 1979-01-01 to 1985-12-03; source msha-controller-operator-history
- **controller_controls_mine:** Gonzales Phillip → Gonzales Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gonzales Phillip → Gonzales Sand Company; 1979-01-01 to 1985-12-03; source msha-controller-operator-history
- **operator_operates_mine:** Sandman Sand & Gravel → Gonzales Pit; 1985-12-04 to 1989-04-25; source msha-controller-operator-history
- **controller_controls_mine:** Brewer L G → Gonzales Pit; 1985-12-04 to 1989-04-25; source msha-controller-operator-history
- **controller_controls_operator:** Brewer L G → Sandman Sand & Gravel; 1985-12-04 to 1989-04-25; source msha-controller-operator-history
- **operator_operates_mine:** Gonzales Sand Company → Gonzales Pit; 1989-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gonzales Phillip → Gonzales Sand Company; 1989-04-26 to current/open; source msha-controller-operator-history