# Relationship history for MSHA mine 4104608

Current hierarchy: **Rodolfo A  Garcia; Nancy  Garcia; Rene  Garcia → Laredo Ready Mix Ltd. → South Laredo Sand and Gravel 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** South Laredo Sand and Gravel, Inc. → South Laredo Sand and Gravel Pit; 2006-07-11 to 2012-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Rodolfo  Garcia et al → South Laredo Sand and Gravel Pit; 2006-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rodolfo  Garcia et al → South Laredo Sand and Gravel, Inc.; 2006-07-11 to 2012-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Laredo Ready Mix Ltd. → South Laredo Sand and Gravel Pit; 2012-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rodolfo  Garcia et al → South Laredo Sand and Gravel Pit; 2012-04-01 to 2026-05-13; source msha-controller-operator-history
- **controller_controls_operator:** Rodolfo  Garcia et al → Laredo Ready Mix Ltd.; 2012-04-01 to 2026-05-13; source msha-controller-operator-history
- **controller_controls_mine:** Nancy  Garcia et al → South Laredo Sand and Gravel Pit; 2026-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nancy  Garcia et al → Laredo Ready Mix Ltd.; 2026-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rodolfo A  Garcia et al → Laredo Ready Mix Ltd.; 2026-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rene  Garcia et al → Laredo Ready Mix Ltd.; 2026-05-14 to current/open; source msha-controller-operator-history