# Relationship history for MSHA mine 4500583

Current hierarchy: **Burnett James E → Maltby Sand & Gravel → Maltby Sand & Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Valley Rock & Aggregate Inc → Maltby Sand & Gravel; 1950-01-01 to 1979-05-07; source msha-controller-operator-history
- **controller_controls_mine:** Valley Rock & Aggregate Inc → Maltby Sand & Gravel; 1950-01-01 to 1979-05-07; source msha-controller-operator-history
- **controller_controls_operator:** Valley Rock & Aggregate Inc → Valley Rock & Aggregate Inc; 1950-01-01 to 1979-05-07; source msha-controller-operator-history
- **operator_operates_mine:** Builders Sand & Gravel Company → Maltby Sand & Gravel; 1979-05-08 to 1980-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Builders Sand & Gravel Company → Maltby Sand & Gravel; 1979-05-08 to 1980-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Builders Sand & Gravel Company → Builders Sand & Gravel Company; 1979-05-08 to 1980-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Maltby Sand & Gravel Company → Maltby Sand & Gravel; 1980-02-01 to 1985-06-05; source msha-controller-operator-history
- **controller_controls_mine:** Chilelli Armando → Maltby Sand & Gravel; 1980-02-01 to 1985-06-05; source msha-controller-operator-history
- **controller_controls_operator:** Chilelli Armando → Maltby Sand & Gravel Company; 1980-02-01 to 1985-06-05; source msha-controller-operator-history
- **operator_operates_mine:** Maltby Sand & Gravel → Maltby Sand & Gravel; 1985-06-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Burnett James E → Maltby Sand & Gravel; 1985-06-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burnett James E → Maltby Sand & Gravel; 1985-06-06 to current/open; source msha-controller-operator-history