# Relationship history for MSHA mine 3200768

Current hierarchy: **Robert E  Cogdill → Aggregate Construction Inc → AGGREGATE WP-4**

- 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:** Robert E  Cogdill → AGGREGATE WP-4; 1986-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Aggregate Construction Inc → AGGREGATE WP-4; 1998-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert E  Cogdill → Aggregate Construction Inc; 1998-08-01 to current/open; source msha-controller-operator-history