# Relationship history for MSHA mine 3304439

Current hierarchy: **Derle C  Slabaugh → D & S Stone LLC → D & S Stone LLC**

- 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

- **operator_operates_mine:** E A Construction Inc → D & S Stone LLC; 1999-07-01 to 2006-05-27; source msha-controller-operator-history
- **controller_controls_mine:** Ellis  Aylsworth → D & S Stone LLC; 1999-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ellis  Aylsworth → E A Construction Inc; 1999-07-01 to 2006-05-27; source msha-controller-operator-history
- **operator_operates_mine:** D & S Stone LLC → D & S Stone LLC; 2006-05-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Derle C  Slabaugh → D & S Stone LLC; 2006-05-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Derle C  Slabaugh → D & S Stone LLC; 2006-05-28 to current/open; source msha-controller-operator-history