# Relationship history for MSHA mine 3608204

Current hierarchy: **Xylem Incorporated → Xylem Water Solutions Zelienople LLC → Glen Gery**

- 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:** K-L Media → Glen Gery; 1990-11-01 to 1992-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Keystone Media Inc  et al → Glen Gery; 1990-11-01 to 1992-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Keystone Media Inc  et al → K-L Media; 1990-11-01 to 1992-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Xylem Water Solutions Zelienople LLC → Glen Gery; 1992-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thames Water Holdings → Glen Gery; 1992-04-01 to 2004-03-18; source msha-controller-operator-history
- **controller_controls_operator:** Thames Water Holdings → Xylem Water Solutions Zelienople LLC; 1992-04-01 to 2004-03-18; source msha-controller-operator-history
- **controller_controls_mine:** Leopold Holding Corporation → Glen Gery; 2004-03-19 to 2006-06-13; source msha-controller-operator-history
- **controller_controls_operator:** Leopold Holding Corporation → Xylem Water Solutions Zelienople LLC; 2004-03-19 to 2006-06-13; source msha-controller-operator-history
- **controller_controls_mine:** ITT Corporation → Glen Gery; 2006-06-14 to 2011-10-23; source msha-controller-operator-history
- **controller_controls_operator:** ITT Corporation → Xylem Water Solutions Zelienople LLC; 2006-06-14 to 2011-10-23; source msha-controller-operator-history
- **controller_controls_mine:** Xylem Incorporated → Glen Gery; 2011-10-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Xylem Incorporated → Xylem Water Solutions Zelienople LLC; 2011-10-24 to current/open; source msha-controller-operator-history