# Relationship history for MSHA mine 4603155

Current hierarchy: **Pilgrim Petroleum Inc → Upshur Redstone Coal Company Inc → Electro 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

- **operator_operates_mine:** Coal Processing Company Inc → Electro Tipple; 1950-01-01 to 1974-01-25; source msha-controller-operator-history
- **controller_controls_mine:** Coal Processing Company Inc → Electro Tipple; 1950-01-01 to 1974-01-25; source msha-controller-operator-history
- **controller_controls_operator:** Coal Processing Company Inc → Coal Processing Company Inc; 1950-01-01 to 1974-01-25; source msha-controller-operator-history
- **operator_operates_mine:** Upshur Redstone Coal Company Inc → Electro Tipple; 1974-01-26 to 1980-09-22; source msha-controller-operator-history
- **controller_controls_mine:** Starkey Clifton C → Electro Tipple; 1974-01-26 to 1980-09-22; source msha-controller-operator-history
- **controller_controls_operator:** Starkey Clifton C → Upshur Redstone Coal Company Inc; 1974-01-26 to 1980-09-22; source msha-controller-operator-history
- **operator_operates_mine:** Upshur Redstone Coal Company Inc → Electro Tipple; 1980-09-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pilgrim Petroleum Inc → Electro Tipple; 1980-09-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pilgrim Petroleum Inc → Upshur Redstone Coal Company Inc; 1980-09-23 to current/open; source msha-controller-operator-history