# Relationship history for MSHA mine 3608643

Current hierarchy: **Gary  Berkley → Mountain Top Coal Company Incorporated → Mountain Top**

- 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:** Mountain Top Coal Company Incorporated → Mountain Top; 1997-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Morgan William J → Mountain Top; 1997-05-01 to 2002-08-25; source msha-controller-operator-history
- **controller_controls_operator:** Morgan William J → Mountain Top Coal Company Incorporated; 1997-05-01 to 2002-08-25; source msha-controller-operator-history
- **controller_controls_mine:** Gary  Berkley → Mountain Top; 2002-08-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Berkley → Mountain Top Coal Company Incorporated; 2002-08-26 to current/open; source msha-controller-operator-history