# Relationship history for MSHA mine 0202746

Current hierarchy: **Carl M  Gray → Harley Gray Stone Co. → Mills**

- 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:** Western States Stone Company Inc → Mills; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carl M  Gray → Mills; 1997-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blaser Aquisition Corporation → Mills; 1997-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Western States Stone Company → Mills; 1997-12-01 to 1998-03-23; source msha-controller-operator-history
- **controller_controls_operator:** Western States Stone Company Inc → Western States Stone Company; 1997-12-01 to 1998-03-23; source msha-controller-operator-history
- **operator_operates_mine:** American Sandstone → Mills; 1998-03-24 to 2007-09-23; source msha-controller-operator-history
- **controller_controls_operator:** Blaser Aquisition Corporation → American Sandstone; 1998-03-24 to 2007-09-23; source msha-controller-operator-history
- **operator_operates_mine:** Cornerstone Materials LLC → Mills; 2007-09-24 to 2014-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Donald L  Blaser → Mills; 2007-09-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald L  Blaser → Cornerstone Materials LLC; 2007-09-24 to 2014-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Harley Gray Stone Co. → Mills; 2014-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carl M  Gray → Harley Gray Stone Co.; 2014-11-01 to current/open; source msha-controller-operator-history