# Relationship history for MSHA mine 1100100

Current hierarchy: **Vulcan Materials Company → Vulcan Construction Materials, LLC → Kankakee Quarry & 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Kankakee Quarry & Mill; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Medusa Aggregates Company → Kankakee Quarry & Mill; 1950-01-01 to 1979-04-18; source msha-controller-operator-history
- **controller_controls_mine:** Medusa Corp → Kankakee Quarry & Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Medusa Corp → Medusa Aggregates Company; 1950-01-01 to 1979-04-18; source msha-controller-operator-history
- **controller_controls_mine:** Crane Company → Kankakee Quarry & Mill; 1978-12-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Medusa Aggregates Company → Kankakee Quarry & Mill; 1979-04-19 to 1982-12-19; source msha-controller-operator-history
- **controller_controls_operator:** Crane Company → Medusa Aggregates Company; 1979-04-19 to 1982-12-19; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Construction Materials, LLC → Kankakee Quarry & Mill; 1982-12-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Construction Materials, LLC; 1982-12-20 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Kankakee Quarry & Mill; 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