# Relationship history for MSHA mine 0900117

Current hierarchy: **Wienerberger AG → General Shale Brick, Inc → Harbin**

- 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:** Chattahoochee Brick Company Inc → Harbin; 1950-01-01 to 1979-10-24; source msha-controller-operator-history
- **controller_controls_mine:** General Shale Products Corp → Harbin; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** General Shale Products Corp → Chattahoochee Brick Company Inc; 1950-01-01 to 1979-10-24; source msha-controller-operator-history
- **operator_operates_mine:** D M S Construction Company Inc → Harbin; 1979-10-25 to 1994-07-04; source msha-controller-operator-history
- **controller_controls_mine:** David M  Smith → Harbin; 1979-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David M  Smith → D M S Construction Company Inc; 1979-10-25 to 1994-07-04; source msha-controller-operator-history
- **controller_controls_mine:** Marley Plc → Harbin; 1986-06-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Chattahoochee Brick Company Inc → Harbin; 1994-07-05 to 2002-07-18; source msha-controller-operator-history
- **controller_controls_operator:** Marley Plc → Chattahoochee Brick Company Inc; 1994-07-05 to 2002-07-18; source msha-controller-operator-history
- **operator_operates_mine:** General Shale Brick, Inc → Harbin; 2002-07-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wienerberger AG → Harbin; 2002-07-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wienerberger AG → General Shale Brick, Inc; 2002-07-19 to current/open; source msha-controller-operator-history