# Relationship history for MSHA mine 3003229

Current hierarchy: **New York Sand Company Llc & Amboy Aggregates Inc → New York Sand & Stone Llc → 25TH STREET PIER**

- 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:** New York Sand & Stone Llc → 25TH STREET PIER; 1998-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** New York Sand Company Llc & Amboy Aggregates Inc → 25TH STREET PIER; 1998-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** New York Sand Company Llc & Amboy Aggregates Inc → New York Sand & Stone Llc; 1998-07-01 to current/open; source msha-controller-operator-history