# Relationship history for MSHA mine 4501908

Current hierarchy: **Ray R  Green → Green'S Excavation & Supply Inc → Green'S 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Allied Concrete Company → Green'S Pit; 1950-01-01 to 1985-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Whitelaw Industries Inc → Green'S Pit; 1950-01-01 to 1985-04-14; source msha-controller-operator-history
- **controller_controls_operator:** Whitelaw Industries Inc → Allied Concrete Company; 1950-01-01 to 1985-04-14; source msha-controller-operator-history
- **operator_operates_mine:** Green'S Excavation & Supply Inc → Green'S Pit; 1985-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ray R  Green → Green'S Pit; 1985-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ray R  Green → Green'S Excavation & Supply Inc; 1985-04-15 to current/open; source msha-controller-operator-history