# Relationship history for MSHA mine 5001556

Current hierarchy: **Jerry  Sadler → Airport Equipment Rentals Inc → Ester**

- 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:** Sphinx Mining Inc → Ester; 1988-06-01 to 2012-02-08; source msha-controller-operator-history
- **controller_controls_mine:** Malvy Technology Inc → Ester; 1988-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Malvy Technology Inc → Sphinx Mining Inc; 1988-06-01 to 2012-02-08; source msha-controller-operator-history
- **operator_operates_mine:** Airport Equipment Rentals Inc → Ester; 2012-02-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jerry  Sadler et al → Ester; 2012-02-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry  Sadler et al → Airport Equipment Rentals Inc; 2012-02-09 to current/open; source msha-controller-operator-history