# Relationship history for MSHA mine 4103600

Current hierarchy: **Atlas Concrete Inc → Ingram Enterprises L.P. → EASTLAND CO PIT**

- 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:** Bruce W  Curry → EASTLAND CO PIT; 1980-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Atlas Concrete Inc → EASTLAND CO PIT; 1988-05-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Breckenridge Ready-Mix Inc → EASTLAND CO PIT; 1990-03-01 to 2006-11-14; source msha-controller-operator-history
- **controller_controls_operator:** Bruce W  Curry → Breckenridge Ready-Mix Inc; 1990-03-01 to 2006-11-14; source msha-controller-operator-history
- **operator_operates_mine:** Ingram Enterprises L.P. → EASTLAND CO PIT; 2006-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Atlas Concrete Inc → Ingram Enterprises L.P.; 2006-11-15 to current/open; source msha-controller-operator-history