# Relationship history for MSHA mine 3000059

Current hierarchy: **St Lawrence Cement LLC → Independent Cement Corp → Hudson Cement And Stone Quarry And Mill**

- 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:** Colonial Sand & Stone Company Inc → Hudson Cement And Stone Quarry And Mill; 1950-01-01 to 1978-05-03; source msha-controller-operator-history
- **controller_controls_mine:** Utilities & Industries Corp → Hudson Cement And Stone Quarry And Mill; 1950-01-01 to 1991-10-15; source msha-controller-operator-history
- **controller_controls_operator:** Utilities & Industries Corp → Colonial Sand & Stone Company Inc; 1950-01-01 to 1978-05-03; source msha-controller-operator-history
- **operator_operates_mine:** Independent Cement Corp → Hudson Cement And Stone Quarry And Mill; 1978-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** St Lawrence Cement LLC → Hudson Cement And Stone Quarry And Mill; 1978-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** St Lawrence Cement LLC → Independent Cement Corp; 1978-05-04 to current/open; source msha-controller-operator-history