# Relationship history for MSHA mine 4103302

Current hierarchy: **Banda Demecio → Ja 490 & Company → Ja 490 & Company Caliche 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Alvarez Construction → Ja 490 & Company Caliche Pit; 1985-04-01 to 1989-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Alfredo  Alvarez → Ja 490 & Company Caliche Pit; 1985-04-01 to 1989-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Alfredo  Alvarez → Alvarez Construction; 1985-04-01 to 1989-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Ja 490 & Company → Ja 490 & Company Caliche Pit; 1989-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Banda Demecio → Ja 490 & Company Caliche Pit; 1989-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Banda Demecio → Ja 490 & Company; 1989-06-01 to current/open; source msha-controller-operator-history