# Relationship history for MSHA mine 3605548

Current hierarchy: **Coleman Vernon C & Randall C → Metco Mining & Minerals Inc → Metco Mining & Minerals Inc**

- 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:** Metco Mining & Minerals Inc → Metco Mining & Minerals Inc; 1975-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Coleman Vernon C & Randall C → Metco Mining & Minerals Inc; 1975-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coleman Vernon C & Randall C → Metco Mining & Minerals Inc; 1975-05-01 to current/open; source msha-controller-operator-history