# Relationship history for MSHA mine 4104494

Current hierarchy: **Jorge  Enriquez → J & L Materials → Enriquez Materials**

- 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:** Aran Construction → Enriquez Materials; 2004-08-24 to 2008-02-25; source msha-controller-operator-history
- **controller_controls_mine:** Tony V  Calderon  et al → Enriquez Materials; 2004-08-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tony V  Calderon  et al → Aran Construction; 2004-08-24 to 2008-02-25; source msha-controller-operator-history
- **controller_controls_operator:** Arnulfo  Lopez  et al → Aran Construction; 2004-08-24 to 2008-02-25; source msha-controller-operator-history
- **controller_controls_mine:** Jorge  Enriquez → Enriquez Materials; 2006-11-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Arnulfo Lopez → Enriquez Materials; 2008-02-26 to 2012-04-13; source msha-controller-operator-history
- **controller_controls_mine:** Arnulfo  Lopez → Enriquez Materials; 2008-02-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arnulfo  Lopez → Arnulfo Lopez; 2008-02-26 to 2012-04-13; source msha-controller-operator-history
- **operator_operates_mine:** J & L Materials → Enriquez Materials; 2012-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jorge  Enriquez → J & L Materials; 2012-04-14 to current/open; source msha-controller-operator-history