# Relationship history for MSHA mine 3600015

Current hierarchy: **Vulcan Materials Company → Vulcan Construction Materials, LLC → HANOVER 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

- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → HANOVER QUARRY; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Bethlehem Mines Corp → HANOVER QUARRY; 1950-01-01 to 1988-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Bethlehem Steel Corp → HANOVER QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bethlehem Steel Corp → Bethlehem Mines Corp; 1950-01-01 to 1988-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Tarmac Plc → HANOVER QUARRY; 1984-12-28 to 2000-10-02; source msha-controller-operator-history
- **operator_operates_mine:** Broyhill & Associates Inc → HANOVER QUARRY; 1988-02-01 to 1990-04-08; source msha-controller-operator-history
- **controller_controls_mine:** Broyhill & Associates Inc → HANOVER QUARRY; 1988-02-01 to 1990-04-08; source msha-controller-operator-history
- **controller_controls_operator:** Broyhill & Associates Inc → Broyhill & Associates Inc; 1988-02-01 to 1990-04-08; source msha-controller-operator-history
- **controller_controls_mine:** George Wimpey Plc → HANOVER QUARRY; 1989-11-02 to 1996-03-26; source msha-controller-operator-history
- **operator_operates_mine:** Wimpey Minerals Usa Inc → HANOVER QUARRY; 1990-04-09 to 1996-03-26; source msha-controller-operator-history
- **controller_controls_operator:** George Wimpey Plc → Wimpey Minerals Usa Inc; 1990-04-09 to 1996-03-26; source msha-controller-operator-history
- **operator_operates_mine:** Tarmac America Inc → HANOVER QUARRY; 1996-03-27 to 2000-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Tarmac Plc → Tarmac America Inc; 1996-03-27 to 2000-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Construction Materials, LLC → HANOVER QUARRY; 2000-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Construction Materials, LLC; 2000-10-01 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → HANOVER QUARRY; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Construction Materials, LLC; 2007-11-16 to current/open; source msha-controller-operator-history