# Relationship history for MSHA mine 1511871

Current hierarchy: **Hufford V  Williams → Williams Brothers Coal Company Inc → E-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

- **operator_operates_mine:** Spotless Coal Company Inc → E-1; 1979-05-01 to 1980-06-09; source msha-controller-operator-history
- **controller_controls_mine:** Lester Robert F → E-1; 1979-05-01 to 1981-02-16; source msha-controller-operator-history
- **controller_controls_operator:** Lester Robert F → Spotless Coal Company Inc; 1979-05-01 to 1980-06-09; source msha-controller-operator-history
- **operator_operates_mine:** Rose Ann Coal Company Inc → E-1; 1980-06-10 to 1985-04-02; source msha-controller-operator-history
- **controller_controls_mine:** Yates Harold → E-1; 1980-06-10 to 1985-04-02; source msha-controller-operator-history
- **controller_controls_operator:** Yates Harold → Rose Ann Coal Company Inc; 1980-06-10 to 1985-04-02; source msha-controller-operator-history
- **operator_operates_mine:** Jim Dandy Coal Company Inc → E-1; 1985-04-03 to 1986-05-01; source msha-controller-operator-history
- **controller_controls_mine:** Workman Benjamin Et Al → E-1; 1985-04-03 to 1987-08-02; source msha-controller-operator-history
- **controller_controls_operator:** Workman Benjamin Et Al → Jim Dandy Coal Company Inc; 1985-04-03 to 1986-05-01; source msha-controller-operator-history
- **operator_operates_mine:** Williams Brothers Coal Company Inc → E-1; 1986-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hufford V  Williams → E-1; 1986-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hufford V  Williams → Williams Brothers Coal Company Inc; 1986-05-02 to current/open; source msha-controller-operator-history