# Relationship history for MSHA mine 4503617

Current hierarchy: **Heidi A  Grooms → A&E LLC → Portable Crusher**

- 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:** A&E LLC → Portable Crusher; 2006-10-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kris E  Wright  et al → Portable Crusher; 2006-10-10 to 2018-03-20; source msha-controller-operator-history
- **controller_controls_operator:** Kris E  Wright  et al → A&E LLC; 2006-10-10 to 2018-03-20; source msha-controller-operator-history
- **controller_controls_operator:** Heidi A  Grooms  et al → A&E LLC; 2006-10-10 to 2018-03-20; source msha-controller-operator-history
- **controller_controls_mine:** Heidi A  Grooms → Portable Crusher; 2018-03-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidi A  Grooms → A&E LLC; 2018-03-21 to current/open; source msha-controller-operator-history