# Relationship history for MSHA mine 4300611

Current hierarchy: **Peter W  Ruby → Taconic Stone LLC → Mammoth 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

- **controller_controls_mine:** Peter W  Ruby → Mammoth Quarry; 1999-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Taconic Stone LLC → Mammoth Quarry; 2004-07-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peter W  Ruby → Taconic Stone LLC; 2004-07-20 to current/open; source msha-controller-operator-history