# Relationship history for MSHA mine 4002781

Current hierarchy: **Walker James H → General Trucking Company Inc → Hickman County #2**

- 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:** M Glenn  West → Hickman County #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** M C West Inc → Hickman County #2; 1982-03-01 to 1983-04-04; source msha-controller-operator-history
- **controller_controls_operator:** M Glenn  West → M C West Inc; 1982-03-01 to 1983-04-04; source msha-controller-operator-history
- **operator_operates_mine:** General Trucking Company Inc → Hickman County #2; 1983-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Walker James H → Hickman County #2; 1983-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walker James H → General Trucking Company Inc; 1983-04-05 to current/open; source msha-controller-operator-history