# Relationship history for MSHA mine 3000055

Current hierarchy: **Heidelberg Materials AG → Heidelberg Materials Northeast-NY LLC → Stafford 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Genesee Le Roy Stone Corp → Stafford Quarry; 1950-01-01 to 2000-02-10; source msha-controller-operator-history
- **controller_controls_mine:** Gene Dewitt Corporation → Stafford Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gene Dewitt Corporation → Genesee Le Roy Stone Corp; 1950-01-01 to 2000-02-10; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Stafford Quarry; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Glsc Inc → Stafford Quarry; 2000-02-11 to 2003-02-04; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Stafford Quarry; 2000-02-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Glsc Inc; 2000-02-11 to 2003-02-04; source msha-controller-operator-history
- **operator_operates_mine:** Heidelberg Materials Northeast-NY LLC → Stafford Quarry; 2003-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Heidelberg Materials Northeast-NY LLC; 2003-02-05 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Stafford Quarry; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Heidelberg Materials Northeast-NY LLC; 2007-08-23 to current/open; source msha-controller-operator-history