# Relationship history for MSHA mine 3609166

Current hierarchy: **John  Maloney; Gary E  Benjamin → Blackknight Quarries Inc → Comstock Quarry**

- 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:** Irene West → Comstock Quarry; 2003-08-07 to 2013-01-16; source msha-controller-operator-history
- **controller_controls_mine:** Irene F  West → Comstock Quarry; 2003-08-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Irene F  West → Irene West; 2003-08-07 to 2013-01-16; source msha-controller-operator-history
- **operator_operates_mine:** Blackknight Quarries Inc → Comstock Quarry; 2013-01-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John  Maloney et al → Comstock Quarry; 2013-01-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Maloney et al → Blackknight Quarries Inc; 2013-01-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary E  Benjamin et al → Blackknight Quarries Inc; 2013-01-17 to current/open; source msha-controller-operator-history