# Relationship history for MSHA mine 1900321

Current hierarchy: **S M Lorusso & Sons Inc → Cape Cod Aggregates Corp → HYANNIS PLANT**

- 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:** Hyannis Sand & Gravel Inc → HYANNIS PLANT; 1950-01-01 to 1987-03-23; source msha-controller-operator-history
- **controller_controls_mine:** Paul  Lorusso → HYANNIS PLANT; 1950-01-01 to 1987-03-24; source msha-controller-operator-history
- **controller_controls_operator:** Paul  Lorusso → Hyannis Sand & Gravel Inc; 1950-01-01 to 1987-03-23; source msha-controller-operator-history
- **controller_controls_mine:** S M Lorusso & Sons Inc → HYANNIS PLANT; 1983-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hyannis Sand & Gravel → HYANNIS PLANT; 1987-03-24 to 2005-06-27; source msha-controller-operator-history
- **controller_controls_mine:** S M Lorusso & Sons Inc → HYANNIS PLANT; 1987-03-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** S M Lorusso & Sons Inc → Hyannis Sand & Gravel; 1987-03-24 to 2005-06-27; source msha-controller-operator-history
- **operator_operates_mine:** Cape Cod Aggregates Corp → HYANNIS PLANT; 2005-06-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** S M Lorusso & Sons Inc → Cape Cod Aggregates Corp; 2005-06-28 to current/open; source msha-controller-operator-history