# Relationship history for MSHA mine 3002819

Current hierarchy: **Christopher  Henry → Rt. 13 Rocks LLC → Cortlandville 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Cortlandville Sand & Gravel Inc → Cortlandville Sand & Gravel; 1987-10-01 to 1994-11-08; source msha-controller-operator-history
- **controller_controls_mine:** Cortlandville Sand & Gravel Inc → Cortlandville Sand & Gravel; 1987-10-01 to 1994-11-08; source msha-controller-operator-history
- **controller_controls_operator:** Cortlandville Sand & Gravel Inc → Cortlandville Sand & Gravel Inc; 1987-10-01 to 1994-11-08; source msha-controller-operator-history
- **operator_operates_mine:** Cortlandville Gravel  Mining Inc → Cortlandville Sand & Gravel; 1994-11-09 to 2014-08-14; source msha-controller-operator-history
- **controller_controls_mine:** Roy  Susskind → Cortlandville Sand & Gravel; 1994-11-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roy  Susskind → Cortlandville Gravel  Mining Inc; 1994-11-09 to 2014-08-14; source msha-controller-operator-history
- **operator_operates_mine:** Rt. 13 Rocks LLC → Cortlandville Sand & Gravel; 2014-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Christopher  Henry → Cortlandville Sand & Gravel; 2014-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Christopher  Henry → Rt. 13 Rocks LLC; 2014-08-15 to current/open; source msha-controller-operator-history