# Relationship history for MSHA mine 4104476

Current hierarchy: **San Isidro Management LC; Blackstone Dilworth 1998 Trust → San Isidro Ready Mix LTD → Hancock 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

- **operator_operates_mine:** San Isidro Ready Mix LTD → Hancock Pit; 2004-05-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** San Isidro Management LC et al → Hancock Pit; 2004-05-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** San Isidro Management LC et al → San Isidro Ready Mix LTD; 2004-05-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blackstone Dilworth 1998 Trust et al → San Isidro Ready Mix LTD; 2004-05-27 to current/open; source msha-controller-operator-history