# Relationship history for MSHA mine 0301535

Current hierarchy: **Unruh Ivan → Russ & Sons Inc → Mine No 3**

- 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

- **controller_controls_mine:** Cobb Jonita → Mine No 3; 1982-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** United States Energy Resources Inc → Mine No 3; 1982-10-01 to 1988-06-19; source msha-controller-operator-history
- **controller_controls_mine:** Land Research & Acquisition Inc → Mine No 3; 1982-10-01 to 1988-06-19; source msha-controller-operator-history
- **controller_controls_operator:** Land Research & Acquisition Inc → United States Energy Resources Inc; 1982-10-01 to 1988-06-19; source msha-controller-operator-history
- **controller_controls_mine:** Unruh Ivan → Mine No 3; 1985-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Seven C'S Construction Company Inc → Mine No 3; 1988-06-20 to 1994-08-07; source msha-controller-operator-history
- **controller_controls_operator:** Cobb Jonita → Seven C'S Construction Company Inc; 1988-06-20 to 1994-08-07; source msha-controller-operator-history
- **operator_operates_mine:** Russ & Sons Inc → Mine No 3; 1994-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Unruh Ivan → Russ & Sons Inc; 1994-08-08 to current/open; source msha-controller-operator-history