# Relationship history for MSHA mine 0101988

Current hierarchy: **Thompson Charles M → Alacoal Companies Inc → Blue Ridge Mining Pit No 5**

- 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

- **controller_controls_mine:** Thompson Charles M → Blue Ridge Mining Pit No 5; 1977-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alacoal Companies Inc → Blue Ridge Mining Pit No 5; 1978-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thompson Charles M → Alacoal Companies Inc; 1978-12-01 to current/open; source msha-controller-operator-history