# Relationship history for MSHA mine 3608951

Current hierarchy: **John  Maloney; Gary E  Benjamin → Black Knight Quarries Inc → H. NAGLE'S 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:** Benjamin Stone → H. NAGLE'S QUARRY; 2001-04-01 to 2013-05-08; source msha-controller-operator-history
- **controller_controls_mine:** Harriett R  Benjamin  et al → H. NAGLE'S QUARRY; 2001-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harriett R  Benjamin  et al → Benjamin Stone; 2001-04-01 to 2013-05-08; source msha-controller-operator-history
- **controller_controls_mine:** John  Maloney et al → H. NAGLE'S QUARRY; 2013-01-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Black Knight Quarries Inc → H. NAGLE'S QUARRY; 2013-05-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Maloney et al → Black Knight Quarries Inc; 2013-05-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary E  Benjamin et al → Black Knight Quarries Inc; 2013-05-09 to current/open; source msha-controller-operator-history