# Relationship history for MSHA mine 3304200

Current hierarchy: **Robert  A  Martin II → Martin Quarry Inc → 416 Sand & 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** State Route 416 Sand & Gravel → 416 Sand & Gravel; 1990-05-01 to 1994-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Jeffrey E  Zink → 416 Sand & Gravel; 1990-05-01 to 1994-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey E  Zink → State Route 416 Sand & Gravel; 1990-05-01 to 1994-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Bulk Materials Inc → 416 Sand & Gravel; 1992-10-21 to 1998-10-12; source msha-controller-operator-history
- **operator_operates_mine:** Northern Ohio Materials Inc → 416 Sand & Gravel; 1994-09-01 to 1998-10-12; source msha-controller-operator-history
- **controller_controls_operator:** Bulk Materials Inc → Northern Ohio Materials Inc; 1994-09-01 to 1998-10-12; source msha-controller-operator-history
- **operator_operates_mine:** State Route 416 Sand & Gravel → 416 Sand & Gravel; 1998-10-13 to 2009-05-03; source msha-controller-operator-history
- **controller_controls_mine:** Joseph B  Marsh et al → 416 Sand & Gravel; 1998-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph B  Marsh et al → State Route 416 Sand & Gravel; 1998-10-13 to 2009-05-03; source msha-controller-operator-history
- **controller_controls_operator:** William P  Marino Jr et al → State Route 416 Sand & Gravel; 1998-10-13 to 2009-05-03; source msha-controller-operator-history
- **operator_operates_mine:** Martin Quarry Inc → 416 Sand & Gravel; 2009-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert  A  Martin II → 416 Sand & Gravel; 2009-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  A  Martin II → Martin Quarry Inc; 2009-05-04 to current/open; source msha-controller-operator-history