# Relationship history for MSHA mine 2601913

Current hierarchy: **Don W  Tibbals → Gopher Construction Inc → Reno  Rock & Asphalt**

- 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:** Don W  Tibbals → Reno  Rock & Asphalt; 1984-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Golden West Paving Inc → Reno  Rock & Asphalt; 1985-04-01 to 1988-02-16; source msha-controller-operator-history
- **controller_controls_mine:** Hank  Ebbert → Reno  Rock & Asphalt; 1985-04-01 to 1988-02-16; source msha-controller-operator-history
- **controller_controls_operator:** Hank  Ebbert → Golden West Paving Inc; 1985-04-01 to 1988-02-16; source msha-controller-operator-history
- **operator_operates_mine:** Miller Construction → Reno  Rock & Asphalt; 1988-02-17 to 1993-06-15; source msha-controller-operator-history
- **controller_controls_mine:** Joe  Miller → Reno  Rock & Asphalt; 1988-02-17 to 1993-06-15; source msha-controller-operator-history
- **controller_controls_operator:** Joe  Miller → Miller Construction; 1988-02-17 to 1993-06-15; source msha-controller-operator-history
- **operator_operates_mine:** Reno Rock & Asphalt Inc → Reno  Rock & Asphalt; 1993-06-16 to 1994-09-19; source msha-controller-operator-history
- **controller_controls_mine:** Reno Rock & Asphalt Company → Reno  Rock & Asphalt; 1993-06-16 to 1994-09-19; source msha-controller-operator-history
- **controller_controls_operator:** Reno Rock & Asphalt Company → Reno Rock & Asphalt Inc; 1993-06-16 to 1994-09-19; source msha-controller-operator-history
- **operator_operates_mine:** Nevada Hydrocarbon Inc → Reno  Rock & Asphalt; 1994-09-20 to 1998-08-23; source msha-controller-operator-history
- **controller_controls_mine:** Charles  Chisholm → Reno  Rock & Asphalt; 1994-09-20 to 1998-08-23; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Chisholm → Nevada Hydrocarbon Inc; 1994-09-20 to 1998-08-23; source msha-controller-operator-history
- **operator_operates_mine:** Gopher Construction Inc → Reno  Rock & Asphalt; 1998-08-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Don W  Tibbals → Gopher Construction Inc; 1998-08-24 to current/open; source msha-controller-operator-history