# Relationship history for MSHA mine 2901700

Current hierarchy: **British Petroleum Company PLC → Sohio Western Mining Company → Screening Plant #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

- **controller_controls_mine:** British Petroleum Company PLC → Screening Plant #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Marinelli Construction Inc → Screening Plant #1; 1950-01-01 to 1980-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Marinelli Arthur N → Screening Plant #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marinelli Arthur N → Marinelli Construction Inc; 1950-01-01 to 1980-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Sohio Western Mining Company → Screening Plant #1; 1980-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** British Petroleum Company PLC → Sohio Western Mining Company; 1980-12-01 to current/open; source msha-controller-operator-history