# Relationship history for MSHA mine 0101793

Current hierarchy: **Waid Carlos E → Carbon Fuel Company Inc → Windham Springs Pit 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Dill Olen A → Windham Springs Pit No 1; 1977-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Carbon Fuel Company Inc → Windham Springs Pit No 1; 1977-10-01 to 1979-01-21; source msha-controller-operator-history
- **controller_controls_operator:** Dill Olen A → Carbon Fuel Company Inc; 1977-10-01 to 1979-01-21; source msha-controller-operator-history
- **operator_operates_mine:** Carbon Fuel Company Inc → Windham Springs Pit No 1; 1979-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Waid Carlos E → Windham Springs Pit No 1; 1979-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Waid Carlos E → Carbon Fuel Company Inc; 1979-01-22 to current/open; source msha-controller-operator-history