# Relationship history for MSHA mine 4607452

Current hierarchy: **William G  Skewes → Murphy'S Branch 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** William G  Skewes → Mine No 1; 1981-08-01 to 1996-01-18; source msha-controller-operator-history
- **operator_operates_mine:** Navaro Mining Inc → Mine No 1; 1988-02-01 to 1988-02-28; source msha-controller-operator-history
- **controller_controls_operator:** William G  Skewes → Navaro Mining Inc; 1988-02-01 to 1988-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Mc Glothlin Coal Company → Mine No 1; 1988-02-29 to 1988-10-24; source msha-controller-operator-history
- **controller_controls_mine:** Fred  McGlothlin et al → Mine No 1; 1988-02-29 to 1988-10-24; source msha-controller-operator-history
- **controller_controls_operator:** Fred  McGlothlin et al → Mc Glothlin Coal Company; 1988-02-29 to 1988-10-24; source msha-controller-operator-history
- **operator_operates_mine:** Murphy'S Branch Inc → Mine No 1; 1988-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William G  Skewes → Mine No 1; 1988-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William G  Skewes → Murphy'S Branch Inc; 1988-10-25 to current/open; source msha-controller-operator-history