# Relationship history for MSHA mine 1101764

Current hierarchy: **Seaforth Mineral & Ore Company Inc → Inverness Mining Company → Spivey 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 → Spivey Mine; 1950-01-01 to 1980-05-12; source msha-controller-operator-history
- **controller_controls_mine:** Allied-Signal Inc → Spivey 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
- **operator_operates_mine:** Inverness Mining Company → Spivey Mine; 1980-05-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Seaforth Mineral & Ore Company Inc → Spivey 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 current/open; source msha-controller-operator-history