# Relationship history for MSHA mine 3102376

Current hierarchy: **Arthur Charles Hengler; Ace Grant McCarthy; Daryl Brent Taylor → NQS D & B LLC → PT-600A**

- 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:** NQS D & B LLC → PT-600A; 2026-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Daryl Brent Taylor et al → PT-600A; 2026-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daryl Brent Taylor et al → NQS D & B LLC; 2026-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ace Grant McCarthy et al → NQS D & B LLC; 2026-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arthur Charles Hengler et al → NQS D & B LLC; 2026-01-01 to current/open; source msha-controller-operator-history