# Relationship history for MSHA mine 3500711

Current hierarchy: **Brian K Martindale → S-C Paving Co → Burdick 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:** Trask River Gravel Inc → Burdick Pit; 1950-01-01 to 1985-08-01; source msha-controller-operator-history
- **controller_controls_mine:** Jack  DeSwart → Burdick Pit; 1950-01-01 to 1985-08-01; source msha-controller-operator-history
- **controller_controls_operator:** Jack  DeSwart → Trask River Gravel Inc; 1950-01-01 to 1985-08-01; source msha-controller-operator-history
- **operator_operates_mine:** S-C Paving Inc → Burdick Pit; 1985-08-02 to 1997-04-20; source msha-controller-operator-history
- **controller_controls_mine:** Dale V  Scott → Burdick Pit; 1985-08-02 to 1997-04-20; source msha-controller-operator-history
- **controller_controls_operator:** Dale V  Scott → S-C Paving Inc; 1985-08-02 to 1997-04-20; source msha-controller-operator-history
- **operator_operates_mine:** S-C Paving Co → Burdick Pit; 1997-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Clay E  Cook → Burdick Pit; 1997-04-21 to 2018-07-01; source msha-controller-operator-history
- **controller_controls_operator:** Clay E  Cook → S-C Paving Co; 1997-04-21 to 2018-07-01; source msha-controller-operator-history
- **controller_controls_mine:** Brian K Martindale → Burdick Pit; 2018-07-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian K Martindale → S-C Paving Co; 2018-07-02 to current/open; source msha-controller-operator-history