# Relationship history for MSHA mine 2500827

Current hierarchy: **Costello Jim J → Costello Sand & Gravel → Costello 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:** Quinn Sand & Gravel → Costello Sand & Gravel; 1950-01-01 to 1979-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Quinn Sand & Gravel → Costello Sand & Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quinn Sand & Gravel → Quinn Sand & Gravel; 1950-01-01 to 1979-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Ainsworth Sand & Gravel → Costello Sand & Gravel; 1979-06-01 to 1987-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Neidfelt Jerome → Costello Sand & Gravel; 1979-06-01 to 1987-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Neidfelt Jerome → Ainsworth Sand & Gravel; 1979-06-01 to 1987-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Costello Sand & Gravel → Costello Sand & Gravel; 1987-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Costello Jim J → Costello Sand & Gravel; 1987-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Costello Jim J → Costello Sand & Gravel; 1987-04-01 to current/open; source msha-controller-operator-history