# Relationship history for MSHA mine 1700743

Current hierarchy: **Kurt D  Hissong → HDC New England Inc → Hay Brook Minerals**

- 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:** North Country Land Inc → Hay Brook Minerals; 2003-04-24 to 2010-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Cindy C  Libby et al → Hay Brook Minerals; 2003-04-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cindy C  Libby et al → North Country Land Inc; 2003-04-24 to 2010-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Robert W  Libby et al → North Country Land Inc; 2003-04-24 to 2010-06-22; source msha-controller-operator-history
- **operator_operates_mine:** HDC New England Inc → Hay Brook Minerals; 2010-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kurt D  Hissong → Hay Brook Minerals; 2010-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kurt D  Hissong → HDC New England Inc; 2010-06-23 to current/open; source msha-controller-operator-history