# Relationship history for MSHA mine 4502212

Current hierarchy: **Jose A  Rivera Jr → Rivera & Green Inc → Cedar Mountain 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

- **operator_operates_mine:** Boulevard Excavating Inc → Cedar Mountain Pit; 1950-01-01 to 1983-03-16; source msha-controller-operator-history
- **controller_controls_mine:** Hansen Bruce → Cedar Mountain Pit; 1950-01-01 to 1983-03-16; source msha-controller-operator-history
- **controller_controls_operator:** Hansen Bruce → Boulevard Excavating Inc; 1950-01-01 to 1983-03-16; source msha-controller-operator-history
- **controller_controls_mine:** Reid Robert G & James R → Cedar Mountain Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Reid Sand & Gravel Inc → Cedar Mountain Pit; 1983-03-17 to 1985-07-21; source msha-controller-operator-history
- **controller_controls_operator:** Reid Robert G & James R → Reid Sand & Gravel Inc; 1983-03-17 to 1985-07-21; source msha-controller-operator-history
- **operator_operates_mine:** Rivera & Green Inc → Cedar Mountain Pit; 1985-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jose A  Rivera Jr → Cedar Mountain Pit; 1985-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jose A  Rivera Jr → Rivera & Green Inc; 1985-07-22 to current/open; source msha-controller-operator-history