# Relationship history for MSHA mine 2401440

Current hierarchy: **Medallion Minerals Inc → Medallion Minerals Inc → Medallion Portable**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Gladstone Crushing & Construction Inc → Medallion Portable; 1978-12-01 to 1985-09-03; source msha-controller-operator-history
- **controller_controls_mine:** Martyn  Salusso → Medallion Portable; 1978-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martyn  Salusso → Gladstone Crushing & Construction Inc; 1978-12-01 to 1985-09-03; source msha-controller-operator-history
- **controller_controls_mine:** Medallion Minerals Inc → Medallion Portable; 1984-10-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Medallion Minerals Inc → Medallion Portable; 1985-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Medallion Minerals Inc → Medallion Minerals Inc; 1985-09-04 to current/open; source msha-controller-operator-history