# Relationship history for MSHA mine 2700252

Current hierarchy: **John  Farrell → Newmarket Sand and Gravel LLC → Newmarket Sand and Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Newmarket Sand & Gravel → Newmarket Sand & Gravel; 1984-07-01 to 1989-12-21; source msha-controller-operator-history
- **controller_controls_mine:** Ronald B Strone → Newmarket Sand & Gravel; 1984-07-01 to 1989-12-21; source msha-controller-operator-history
- **controller_controls_operator:** Ronald B Strone → Newmarket Sand & Gravel; 1984-07-01 to 1989-12-21; source msha-controller-operator-history
- **operator_operates_mine:** Newmarket Sand & Gravel → Newmarket Sand & Gravel; 1989-12-22 to 2026-04-30; source msha-controller-operator-history
- **controller_controls_mine:** William E  Chick → Newmarket Sand & Gravel; 1989-12-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William E  Chick → Newmarket Sand & Gravel; 1989-12-22 to 2026-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Newmarket Sand & Gravel LLC → Newmarket Sand & Gravel; 2026-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John  Farrell → Newmarket Sand & Gravel; 2026-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Farrell → Newmarket Sand & Gravel LLC; 2026-05-01 to current/open; source msha-controller-operator-history