# Relationship history for MSHA mine 2002843

Current hierarchy: **Mike  Todd → Mike Todd → Mike Todd**

- 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:** B & G Sand & Gravel → Mike Todd; 1990-05-01 to 1998-01-02; source msha-controller-operator-history
- **controller_controls_mine:** Myron  Butts → Mike Todd; 1990-05-01 to 1998-01-02; source msha-controller-operator-history
- **controller_controls_operator:** Myron  Butts → B & G Sand & Gravel; 1990-05-01 to 1998-01-02; source msha-controller-operator-history
- **operator_operates_mine:** Mike Todd → Mike Todd; 1998-01-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mike  Todd → Mike Todd; 1998-01-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike  Todd → Mike Todd; 1998-01-03 to current/open; source msha-controller-operator-history