# Relationship history for MSHA mine 1511827

Current hierarchy: **Cook James D → Supreme Coal Sales Inc → Tipple**

- 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:** Boorhem William → Tipple; 1974-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Boorhem-Capps Coal Company → Tipple; 1979-08-01 to 1980-11-16; source msha-controller-operator-history
- **controller_controls_operator:** Boorhem William → Boorhem-Capps Coal Company; 1979-08-01 to 1980-11-16; source msha-controller-operator-history
- **operator_operates_mine:** Supreme Coal Sales Inc → Tipple; 1980-11-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cook James D → Tipple; 1980-11-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cook James D → Supreme Coal Sales Inc; 1980-11-17 to current/open; source msha-controller-operator-history