# Relationship history for MSHA mine 4403472

Current hierarchy: **Horace Garrison  Hill → Hills Coal Co., Inc. → Tipple #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

- **operator_operates_mine:** Westmoreland Coal Company → Tipple #1; 1950-01-01 to 1986-11-05; source msha-controller-operator-history
- **controller_controls_mine:** Westmoreland Coal Company → Tipple #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Westmoreland Coal Company → Westmoreland Coal Company; 1950-01-01 to 1986-11-05; source msha-controller-operator-history
- **operator_operates_mine:** Skyline Enterprises Of Va Inc → Tipple #1; 1986-11-06 to 1987-05-12; source msha-controller-operator-history
- **controller_controls_mine:** Charles D  Litton → Tipple #1; 1986-11-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles D  Litton → Skyline Enterprises Of Va Inc; 1986-11-06 to 1987-05-12; source msha-controller-operator-history
- **operator_operates_mine:** Westmoreland Coal Company → Tipple #1; 1987-05-13 to 1988-09-25; source msha-controller-operator-history
- **controller_controls_operator:** Westmoreland Coal Company → Westmoreland Coal Company; 1987-05-13 to 1988-09-25; source msha-controller-operator-history
- **operator_operates_mine:** Skyline Enterprises Of Va Inc → Tipple #1; 1988-09-26 to 2002-02-25; source msha-controller-operator-history
- **controller_controls_operator:** Charles D  Litton → Skyline Enterprises Of Va Inc; 1988-09-26 to 2002-02-25; source msha-controller-operator-history
- **controller_controls_mine:** Charles D  Litton → Tipple #1; 1989-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pinnacle Resources, L.L.C. → Tipple #1; 2002-02-26 to 2003-12-29; source msha-controller-operator-history
- **controller_controls_operator:** Charles D  Litton → Pinnacle Resources, L.L.C.; 2002-02-26 to 2003-12-29; source msha-controller-operator-history
- **operator_operates_mine:** Hills Coal Co., Inc. → Tipple #1; 2003-12-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Horace Garrison  Hill → Tipple #1; 2003-12-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horace Garrison  Hill → Hills Coal Co., Inc.; 2003-12-30 to current/open; source msha-controller-operator-history