# Relationship history for MSHA mine 3607161

Current hierarchy: **David P  Hoobler → Slippery Rock Materials Inc → Cress Pit**

- 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:** Slippery Rock Aggregates Div/Russell Ind Inc → Cress Pit; 1981-07-01 to 1994-12-06; source msha-controller-operator-history
- **controller_controls_mine:** Stephen P  Russell → Cress Pit; 1981-07-01 to 1994-12-06; source msha-controller-operator-history
- **controller_controls_operator:** Stephen P  Russell → Slippery Rock Aggregates Div/Russell Ind Inc; 1981-07-01 to 1994-12-06; source msha-controller-operator-history
- **operator_operates_mine:** Slippery Rock Materials Inc → Cress Pit; 1994-12-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David P  Hoobler → Cress Pit; 1994-12-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David P  Hoobler → Slippery Rock Materials Inc; 1994-12-07 to current/open; source msha-controller-operator-history