# Relationship history for MSHA mine 3301891

Current hierarchy: **American Barrick Resources Corp → Muskingum Mining Inc → Muskingum Mine**

- 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:** Gilbert Fuel Company → Muskingum Mine; 1950-01-01 to 1977-06-12; source msha-controller-operator-history
- **controller_controls_mine:** Boich Michael M → Muskingum Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Boich Michael M → Gilbert Fuel Company; 1950-01-01 to 1977-06-12; source msha-controller-operator-history
- **controller_controls_mine:** American Barrick Resources Corp → Muskingum Mine; 1975-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Muskingum Mining Inc → Muskingum Mine; 1977-06-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** American Barrick Resources Corp → Muskingum Mining Inc; 1977-06-13 to current/open; source msha-controller-operator-history