# Relationship history for MSHA mine 4604761

Current hierarchy: **Craig  St Clair → B & L Excavating Company → B & L Excavating Quarry**

- 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:** State Construction Inc → B & L Excavating Quarry; 1950-01-01 to 1983-07-06; source msha-controller-operator-history
- **controller_controls_mine:** R E  Troy → B & L Excavating Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** R E  Troy → State Construction Inc; 1950-01-01 to 1983-07-06; source msha-controller-operator-history
- **operator_operates_mine:** B & L Excavating Company → B & L Excavating Quarry; 1983-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Craig  St Clair → B & L Excavating Quarry; 1983-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Craig  St Clair → B & L Excavating Company; 1983-07-07 to current/open; source msha-controller-operator-history