# Relationship history for MSHA mine 1400202

Current hierarchy: **David  Nation → Nation Rock → Nation Rock**

- 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:** Wade Crushed Stone → Nation Rock; 1950-01-01 to 1980-01-08; source msha-controller-operator-history
- **controller_controls_mine:** Wade Agricultural Products Inc → Nation Rock; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wade Agricultural Products Inc → Wade Crushed Stone; 1950-01-01 to 1980-01-08; source msha-controller-operator-history
- **controller_controls_mine:** Artman Lee Roy → Nation Rock; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B-Jay Rock Products → Nation Rock; 1980-01-09 to 2001-07-01; source msha-controller-operator-history
- **controller_controls_operator:** Artman Lee Roy → B-Jay Rock Products; 1980-01-09 to 2001-07-01; source msha-controller-operator-history
- **operator_operates_mine:** Nation Rock → Nation Rock; 2001-07-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David  Nation → Nation Rock; 2001-07-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Nation → Nation Rock; 2001-07-02 to current/open; source msha-controller-operator-history