# Relationship history for MSHA mine 2902324

Current hierarchy: **Roberta  Jaramillo; Margarito A  Jaramillo → Roberta & Margarito Jaramillo → Gerhardt**

- 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:** Elite Rock and Stone → Gerhardt; 2006-05-18 to 2007-05-24; source msha-controller-operator-history
- **controller_controls_mine:** John  Schroeder → Gerhardt; 2006-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Schroeder → Elite Rock and Stone; 2006-05-18 to 2007-05-24; source msha-controller-operator-history
- **operator_operates_mine:** Roberta & Margarito Jaramillo → Gerhardt; 2007-05-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roberta  Jaramillo et al → Gerhardt; 2007-05-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roberta  Jaramillo et al → Roberta & Margarito Jaramillo; 2007-05-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Margarito A  Jaramillo et al → Roberta & Margarito Jaramillo; 2007-05-25 to current/open; source msha-controller-operator-history