# Relationship history for MSHA mine 4104993

Current hierarchy: **William Clay  Coleman → South Texas Aggregates Inc → Amigos Ranch**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** William Clay  Coleman → Amigos Ranch; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** South Texas Aggregates Inc → Amigos Ranch; 2012-11-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William Clay  Coleman → South Texas Aggregates Inc; 2012-11-13 to current/open; source msha-controller-operator-history