# Relationship history for MSHA mine 0405090

Current hierarchy: **Hayes Edward T Jr → Ammex Aggregate Corp → Ammex Aggregate #1**

- 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

- **operator_operates_mine:** Southwest Construction Aggregates Inc → Ammex Aggregate #1; 1990-05-01 to 1991-03-06; source msha-controller-operator-history
- **controller_controls_mine:** Cuevas Carlos → Ammex Aggregate #1; 1990-05-01 to 1991-03-06; source msha-controller-operator-history
- **controller_controls_operator:** Cuevas Carlos → Southwest Construction Aggregates Inc; 1990-05-01 to 1991-03-06; source msha-controller-operator-history
- **operator_operates_mine:** Ammex Aggregate Corp → Ammex Aggregate #1; 1991-03-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hayes Edward T Jr → Ammex Aggregate #1; 1991-03-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hayes Edward T Jr → Ammex Aggregate Corp; 1991-03-07 to current/open; source msha-controller-operator-history