# Relationship history for MSHA mine 3609861

Current hierarchy: **William J  Brewer → B & B Quarry → B & B Quarry**

- 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

- **operator_operates_mine:** B & B Quarry → B & B Quarry; 2010-06-30 to 2021-04-05; source msha-controller-operator-history
- **controller_controls_mine:** William J  Brewer → B & B Quarry; 2010-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William J  Brewer → B & B Quarry; 2010-06-30 to 2021-04-05; source msha-controller-operator-history
- **operator_operates_mine:** B & B Quarry → B & B Quarry; 2021-04-06 to 2026-07-06; source msha-controller-operator-history
- **controller_controls_mine:** Corey W  Brewer → B & B Quarry; 2021-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Corey W  Brewer → B & B Quarry; 2021-04-06 to 2026-07-06; source msha-controller-operator-history
- **operator_operates_mine:** B & B Quarry → B & B Quarry; 2026-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William J  Brewer → B & B Quarry; 2026-07-07 to current/open; source msha-controller-operator-history