# Relationship history for MSHA mine 3002754

Current hierarchy: **CRH PLC → Dolomite Group → Howard 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Steuben County-Ny → Howard Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert U  Blades Jr → Howard Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Steuben County Highway Department → Howard Plant; 1986-09-01 to 1986-12-02; source msha-controller-operator-history
- **controller_controls_operator:** Steuben County-Ny → Steuben County Highway Department; 1986-09-01 to 1986-12-02; source msha-controller-operator-history
- **operator_operates_mine:** Town Of Howard → Howard Plant; 1986-12-03 to 1996-04-23; source msha-controller-operator-history
- **controller_controls_mine:** Town Of Howard-NY → Howard Plant; 1986-12-03 to 1996-04-23; source msha-controller-operator-history
- **controller_controls_operator:** Town Of Howard-NY → Town Of Howard; 1986-12-03 to 1996-04-23; source msha-controller-operator-history
- **operator_operates_mine:** Blades Construction Products Corp. → Howard Plant; 1996-04-24 to 2010-04-11; source msha-controller-operator-history
- **controller_controls_operator:** Robert U  Blades Jr → Blades Construction Products Corp.; 1996-04-24 to 2010-04-11; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Howard Plant; 2000-06-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dolomite Group → Howard Plant; 2010-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Dolomite Group; 2010-04-12 to current/open; source msha-controller-operator-history