# Relationship history for MSHA mine 4406115

Current hierarchy: **Ernest E  Varney → Black Widow Collieries Ltd → 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:** Wolford Michael A & Steve → Mine No 3; 1977-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Triple W Coal Company Inc → Mine No 3; 1984-07-01 to 1988-08-21; source msha-controller-operator-history
- **controller_controls_operator:** Wolford Michael A & Steve → Triple W Coal Company Inc; 1984-07-01 to 1988-08-21; source msha-controller-operator-history
- **operator_operates_mine:** Black Widow Collieries Ltd → Mine No 3; 1988-08-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ernest E  Varney et al → Mine No 3; 1988-08-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ernest E  Varney et al → Black Widow Collieries Ltd; 1988-08-22 to current/open; source msha-controller-operator-history