# Relationship history for MSHA mine 4605136

Current hierarchy: **T W Oil Inc → White Ridge Coal Co Inc → Hinton 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:** T W Oil Inc → Hinton Tipple; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** White Ridge Coal Co Inc → Hinton Tipple; 1976-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** T W Oil Inc → White Ridge Coal Co Inc; 1976-04-29 to current/open; source msha-controller-operator-history