# Relationship history for MSHA mine 0101438

Current hierarchy: **Thompson Charles M → Alacoal Companies Inc → Blue Ridge No 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:** D & S Coal Co → Blue Ridge No 1; 1976-01-01 to 1976-03-05; source msha-controller-operator-history
- **controller_controls_mine:** Sprinkle Herschel → Blue Ridge No 1; 1976-01-01 to 1976-03-05; source msha-controller-operator-history
- **controller_controls_operator:** Sprinkle Herschel → D & S Coal Co; 1976-01-01 to 1976-03-05; source msha-controller-operator-history
- **operator_operates_mine:** Blue Ridge Mining Co → Blue Ridge No 1; 1976-03-06 to 1978-01-10; source msha-controller-operator-history
- **controller_controls_mine:** Tracy W G Jr → Blue Ridge No 1; 1976-03-06 to 1978-01-10; source msha-controller-operator-history
- **controller_controls_operator:** Tracy W G Jr → Blue Ridge Mining Co; 1976-03-06 to 1978-01-10; source msha-controller-operator-history
- **controller_controls_mine:** Thompson Charles M → Blue Ridge No 1; 1977-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alacoal Companies Inc → Blue Ridge No 1; 1978-01-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thompson Charles M → Alacoal Companies Inc; 1978-01-11 to current/open; source msha-controller-operator-history