# Relationship history for MSHA mine 0200656

Current hierarchy: **Peter Kiewit Sons' Inc → Metro Materials Globe → MAMMOTH**

- 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:** Fred L Clark Trucking Company → MAMMOTH; 1950-01-01 to 2000-06-25; source msha-controller-operator-history
- **controller_controls_mine:** Charles W  Clark → MAMMOTH; 1950-01-01 to 2000-06-25; source msha-controller-operator-history
- **controller_controls_operator:** Charles W  Clark → Fred L Clark Trucking Company; 1950-01-01 to 2000-06-25; source msha-controller-operator-history
- **operator_operates_mine:** Metro Materials Globe → MAMMOTH; 2000-06-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Peter Kiewit Sons' Inc → MAMMOTH; 2000-06-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peter Kiewit Sons' Inc → Metro Materials Globe; 2000-06-26 to current/open; source msha-controller-operator-history