# Relationship history for MSHA mine 1100059

Current hierarchy: **Vulcan Materials Company → Vulcan Materials Company → Fairbury 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) → Fairbury Quarry; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Medusa Aggregates Company → Fairbury Quarry; 1950-01-01 to 1978-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Medusa Corp → Fairbury Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Medusa Corp → Medusa Aggregates Company; 1950-01-01 to 1978-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Albert  Lamb → Fairbury Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Crane Company → Fairbury Quarry; 1978-12-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Medusa Aggregates Company → Fairbury Quarry; 1979-01-01 to 1980-10-13; source msha-controller-operator-history
- **controller_controls_operator:** Crane Company → Medusa Aggregates Company; 1979-01-01 to 1980-10-13; source msha-controller-operator-history
- **operator_operates_mine:** Pontiac Stone Company → Fairbury Quarry; 1980-10-14 to 1981-12-14; source msha-controller-operator-history
- **controller_controls_operator:** Albert  Lamb → Pontiac Stone Company; 1980-10-14 to 1981-12-14; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Materials Company → Fairbury Quarry; 1981-12-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Materials Company; 1981-12-15 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Fairbury Quarry; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Materials Company; 2007-11-16 to current/open; source msha-controller-operator-history