# Relationship history for MSHA mine 4103820

Current hierarchy: **Gerardo  Velasquez → Best Rock → Yellow Stone Mine**

- 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 Quarry of El Paso → Yellow Stone Mine; 1994-05-01 to 2001-10-11; source msha-controller-operator-history
- **controller_controls_mine:** Eduardo  Velasquez → Yellow Stone Mine; 1994-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eduardo  Velasquez → Southwest Quarry of El Paso; 1994-05-01 to 2001-10-11; source msha-controller-operator-history
- **operator_operates_mine:** Best Rock → Yellow Stone Mine; 2001-10-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gerardo  Velasquez → Yellow Stone Mine; 2001-10-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gerardo  Velasquez → Best Rock; 2001-10-12 to current/open; source msha-controller-operator-history