# Relationship history for MSHA mine 2003169

Current hierarchy: **Sarah B Burton; Frederick George Burton Jr → Precision Excavation, Inc. → BILL BURTON 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:** Newberry Redi-Mix Inc → BILL BURTON PIT; 2000-08-01 to 2014-05-07; source msha-controller-operator-history
- **controller_controls_mine:** William J Burton → BILL BURTON PIT; 2000-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William J Burton → Newberry Redi-Mix Inc; 2000-08-01 to 2014-05-07; source msha-controller-operator-history
- **operator_operates_mine:** Precision Redi-Mix Inc. → BILL BURTON PIT; 2014-05-08 to 2022-12-04; source msha-controller-operator-history
- **controller_controls_mine:** Frederick G  Burton Jr → BILL BURTON PIT; 2014-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frederick G  Burton Jr → Precision Redi-Mix Inc.; 2014-05-08 to 2022-12-04; source msha-controller-operator-history
- **operator_operates_mine:** Precision Excavation, Inc. → BILL BURTON PIT; 2022-12-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sarah B Burton et al → BILL BURTON PIT; 2022-12-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sarah B Burton et al → Precision Excavation, Inc.; 2022-12-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frederick George Burton Jr et al → Precision Excavation, Inc.; 2022-12-05 to current/open; source msha-controller-operator-history