# Relationship history for MSHA mine 0301776

Current hierarchy: **Scott H  Kaufman → Pyramid Rock & Timber Inc → HATTIEVILLE 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Pyramid Rock & Timber Inc → HATTIEVILLE QUARRY; 1996-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Scott H  Kaufman  et al → HATTIEVILLE QUARRY; 1996-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott H  Kaufman  et al → Pyramid Rock & Timber Inc; 1996-08-01 to current/open; source msha-controller-operator-history