# Relationship history for MSHA mine 0100793

Current hierarchy: **Walter Energy Incorporated → Taft Coal Sales and Associates, Inc → Liberty Hill Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** A J Taft Coal Company Inc → Liberty Hill Mine; 1950-01-01 to 2008-09-03; source msha-controller-operator-history
- **controller_controls_mine:** A J  Taft → Liberty Hill Mine; 1950-01-01 to 2003-08-10; source msha-controller-operator-history
- **controller_controls_operator:** A J  Taft → A J Taft Coal Company Inc; 1950-01-01 to 2003-08-10; source msha-controller-operator-history
- **controller_controls_mine:** A J  Taft → Liberty Hill Mine; 1990-01-01 to 2008-09-03; source msha-controller-operator-history
- **operator_operates_mine:** Taft Coal Sales and Associates, Inc → Liberty Hill Mine; 2008-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Walter Energy Incorporated → Liberty Hill Mine; 2008-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walter Energy Incorporated → Taft Coal Sales and Associates, Inc; 2008-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** A J  Taft → Taft Coal Sales and Associates, Inc; 2008-09-04 to 2008-09-03; source msha-controller-operator-history