# Relationship history for MSHA mine 4201620

Current hierarchy: **Harvey  Cahoon → Interstate Brick Company → Montello Pit**

- 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

- **controller_controls_mine:** Anthony T Peck → Montello Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Thomas J Peck & Sons Inc → Montello Pit; 1979-01-01 to 1986-11-10; source msha-controller-operator-history
- **controller_controls_operator:** Anthony T Peck → Thomas J Peck & Sons Inc; 1979-01-01 to 1986-11-10; source msha-controller-operator-history
- **controller_controls_mine:** Harvey  Cahoon → Montello Pit; 1986-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Interstate Brick Company → Montello Pit; 1986-11-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harvey  Cahoon → Interstate Brick Company; 1986-11-11 to current/open; source msha-controller-operator-history