# Relationship history for MSHA mine 1100791

Current hierarchy: **Atochem North America Inc → Ozark-Mahoning Company → Minerva No 1 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:** Allied Chemical Corp → Minerva No 1 Mine; 1950-01-01 to 1980-05-12; source msha-controller-operator-history
- **controller_controls_mine:** Allied-Signal Inc → Minerva No 1 Mine; 1950-01-01 to 1980-05-12; source msha-controller-operator-history
- **controller_controls_operator:** Allied-Signal Inc → Allied Chemical Corp; 1950-01-01 to 1980-05-12; source msha-controller-operator-history
- **controller_controls_mine:** Pennwalt Corp → Minerva No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Inverness Mining Company → Minerva No 1 Mine; 1980-05-13 to 1988-05-03; source msha-controller-operator-history
- **controller_controls_mine:** Seaforth Mineral & Ore Company Inc → Minerva No 1 Mine; 1980-05-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Seaforth Mineral & Ore Company Inc → Inverness Mining Company; 1980-05-13 to 1988-05-03; source msha-controller-operator-history
- **operator_operates_mine:** Ozark-Mahoning Company → Minerva No 1 Mine; 1988-05-04 to 1991-01-08; source msha-controller-operator-history
- **controller_controls_operator:** Pennwalt Corp → Ozark-Mahoning Company; 1988-05-04 to 1991-01-08; source msha-controller-operator-history
- **operator_operates_mine:** Ozark-Mahoning Company → Minerva No 1 Mine; 1991-01-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Atochem North America Inc → Minerva No 1 Mine; 1991-01-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Atochem North America Inc → Ozark-Mahoning Company; 1991-01-09 to current/open; source msha-controller-operator-history