# Relationship history for MSHA mine 1512713

Current hierarchy: **Adams Bobby W & Paul → Four Adams Coal Company Inc → #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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Webb Thomas H → #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** F S Coal Company → #1; 1981-01-01 to 1984-03-27; source msha-controller-operator-history
- **controller_controls_mine:** Spangler Fred R Et Al → #1; 1981-01-01 to 1988-08-17; source msha-controller-operator-history
- **controller_controls_operator:** Spangler Fred R Et Al → F S Coal Company; 1981-01-01 to 1984-03-27; source msha-controller-operator-history
- **operator_operates_mine:** Webb-Elkhorn Coal Corp → #1; 1984-03-28 to 1984-05-15; source msha-controller-operator-history
- **controller_controls_operator:** Webb Thomas H → Webb-Elkhorn Coal Corp; 1984-03-28 to 1984-05-15; source msha-controller-operator-history
- **operator_operates_mine:** Hubbard Enterprise Inc → #1; 1984-05-16 to 1986-09-01; source msha-controller-operator-history
- **controller_controls_mine:** Hubbard Bruce & Roger → #1; 1984-05-16 to 1986-09-01; source msha-controller-operator-history
- **controller_controls_operator:** Hubbard Bruce & Roger → Hubbard Enterprise Inc; 1984-05-16 to 1986-09-01; source msha-controller-operator-history
- **operator_operates_mine:** F S Coal Company → #1; 1986-09-02 to 1988-08-17; source msha-controller-operator-history
- **controller_controls_operator:** Spangler Fred R Et Al → F S Coal Company; 1986-09-02 to 1988-08-17; source msha-controller-operator-history
- **operator_operates_mine:** F & S Coal Company → #1; 1988-08-18 to 1991-04-23; source msha-controller-operator-history
- **controller_controls_mine:** Gerwin Robert E → #1; 1988-08-18 to 1991-04-23; source msha-controller-operator-history
- **controller_controls_operator:** Gerwin Robert E → F & S Coal Company; 1988-08-18 to 1991-04-23; source msha-controller-operator-history
- **operator_operates_mine:** F S Coal Company → #1; 1991-04-24 to 1993-02-09; source msha-controller-operator-history
- **controller_controls_mine:** Childers Michael & Pat Et Al → #1; 1991-04-24 to 1993-02-09; source msha-controller-operator-history
- **controller_controls_operator:** Childers Michael & Pat Et Al → F S Coal Company; 1991-04-24 to 1993-02-09; source msha-controller-operator-history
- **operator_operates_mine:** Four Adams Coal Company Inc → #1; 1993-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Adams Bobby W & Paul → #1; 1993-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adams Bobby W & Paul → Four Adams Coal Company Inc; 1993-02-10 to current/open; source msha-controller-operator-history