# Relationship history for MSHA mine 4608706

Current hierarchy: **Michelle  Hatfield → Walcoal, 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:** Brian  Cline → Mine No 1; 1997-07-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Albatross Mining Corp → Mine No 1; 1998-01-01 to 2000-10-17; source msha-controller-operator-history
- **controller_controls_operator:** Brian  Cline → Albatross Mining Corp; 1998-01-01 to 2000-10-17; source msha-controller-operator-history
- **controller_controls_mine:** Richard F  Baugh → Mine No 1; 2000-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Corbadd Inc → Mine No 1; 2000-10-18 to 2001-04-03; source msha-controller-operator-history
- **controller_controls_operator:** Richard F  Baugh → Corbadd Inc; 2000-10-18 to 2001-04-03; source msha-controller-operator-history
- **operator_operates_mine:** Walcoal, Inc → Mine No 1; 2001-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michelle  Hatfield → Mine No 1; 2002-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michelle  Hatfield → Walcoal, Inc; 2002-09-17 to current/open; source msha-controller-operator-history