# Relationship history for MSHA mine 3609256

Current hierarchy: **Regina A  Constantica; Dennis K  Snyder II → S&S Coal Co. LLC → No. 1 Rock Slope**

- 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

- **controller_controls_mine:** Dennis  Snyder → No. 1 Rock Slope; 1976-10-23 to 2005-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Snyder Coal Company → No. 1 Rock Slope; 2004-06-10 to 2006-06-29; source msha-controller-operator-history
- **controller_controls_operator:** Dennis  Snyder → Snyder Coal Company; 2004-06-10 to 2005-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Dennis K  Snyder II → No. 1 Rock Slope; 2005-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis K  Snyder II → Snyder Coal Company; 2005-09-01 to 2006-06-29; source msha-controller-operator-history
- **operator_operates_mine:** S & S Coal Co LLC → No. 1 Rock Slope; 2006-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Regina A  Constantica et al → No. 1 Rock Slope; 2006-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Regina A  Constantica et al → S & S Coal Co LLC; 2006-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis K  Snyder II et al → S & S Coal Co LLC; 2006-06-30 to current/open; source msha-controller-operator-history