# Relationship history for MSHA mine 3609542

Current hierarchy: **Clyde Holding Inc → NEISWONGER CONSTRUCTION INC → SEWICKLEY MINE**

- 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:** David C  Neiswonger et al → SEWICKLEY MINE; 2003-07-21 to 2020-04-24; source msha-controller-operator-history
- **operator_operates_mine:** Ridge Limestone Inc → SEWICKLEY MINE; 2007-08-13 to 2018-04-18; source msha-controller-operator-history
- **controller_controls_mine:** Dolores M  Kravetsky → SEWICKLEY MINE; 2007-08-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dolores M  Kravetsky → Ridge Limestone Inc; 2007-08-13 to 2018-04-18; source msha-controller-operator-history
- **operator_operates_mine:** Neiswonger Construction Inc → SEWICKLEY MINE; 2018-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David C  Neiswonger et al → Neiswonger Construction Inc; 2018-04-19 to 2020-04-24; source msha-controller-operator-history
- **controller_controls_mine:** Clyde Holding Inc → SEWICKLEY MINE; 2020-04-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clyde Holding Inc → Neiswonger Construction Inc; 2020-04-25 to current/open; source msha-controller-operator-history