# Relationship history for MSHA mine 1512546

Current hierarchy: **Hall Terry R → S & H Coal Company Inc → Mine No 1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** N A M Coal Company Inc → Mine No 1; 1980-09-01 to 1982-06-08; source msha-controller-operator-history
- **controller_controls_mine:** Dye Ricky G Et Al → Mine No 1; 1980-09-01 to 1982-06-08; source msha-controller-operator-history
- **controller_controls_operator:** Dye Ricky G Et Al → N A M Coal Company Inc; 1980-09-01 to 1982-06-08; source msha-controller-operator-history
- **operator_operates_mine:** P I A Mining Company Inc → Mine No 1; 1982-06-09 to 1986-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Larry  Thornsberry et al → Mine No 1; 1982-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Thornsberry et al → P I A Mining Company Inc; 1982-06-09 to 1986-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Mc Pike Energy Inc → Mine No 1; 1986-03-01 to 1988-11-29; source msha-controller-operator-history
- **controller_controls_mine:** Hall Hargis → Mine No 1; 1986-03-01 to 1988-11-29; source msha-controller-operator-history
- **controller_controls_operator:** Hall Hargis → Mc Pike Energy Inc; 1986-03-01 to 1988-11-29; source msha-controller-operator-history
- **operator_operates_mine:** Amba Energy → Mine No 1; 1988-11-30 to 1992-10-14; source msha-controller-operator-history
- **controller_controls_mine:** Charles  Hunt → Mine No 1; 1988-11-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Hunt → Amba Energy; 1988-11-30 to 1992-10-14; source msha-controller-operator-history
- **operator_operates_mine:** S & H Coal Company Inc → Mine No 1; 1992-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hall Terry R → Mine No 1; 1992-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hall Terry R → S & H Coal Company Inc; 1992-10-15 to current/open; source msha-controller-operator-history