# Relationship history for MSHA mine 3800637

Current hierarchy: **Wienerberger AG → General Shale Brick, Inc. → Martin 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:** Matthew A  Ferro Jr → Martin Mine; 1950-01-01 to 1994-08-03; source msha-controller-operator-history
- **controller_controls_mine:** Franklin Industries Inc → Martin Mine; 1950-01-01 to 2006-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Neal  Cunningham  et al → Martin Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kmg Minerals Inc → Martin Mine; 1989-03-01 to 1994-07-27; source msha-controller-operator-history
- **controller_controls_operator:** Matthew A  Ferro Jr → Kmg Minerals Inc; 1989-03-01 to 1994-07-27; source msha-controller-operator-history
- **operator_operates_mine:** Franklin Industrial Minerals → Martin Mine; 1994-07-28 to 1999-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Franklin Industries Inc → Franklin Industrial Minerals; 1994-07-28 to 1999-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Oglebay Norton Specialty Minerals Inc → Martin Mine; 1999-12-01 to 1999-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Oglebay Norton Company → Martin Mine; 1999-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oglebay Norton Company → Oglebay Norton Specialty Minerals Inc; 1999-12-01 to 1999-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Cunningham Brick Co., Inc. → Martin Mine; 2000-01-01 to 2013-12-08; source msha-controller-operator-history
- **controller_controls_operator:** Neal  Cunningham  et al → Cunningham Brick Co., Inc.; 2000-01-01 to 2013-12-08; source msha-controller-operator-history
- **controller_controls_mine:** Wienerberger AG → Martin Mine; 2002-07-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lhoist Group → Martin Mine; 2006-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lhoist Group → Franklin Industrial Minerals; 2006-12-01 to 1999-11-30; source msha-controller-operator-history
- **operator_operates_mine:** General Shale Brick, Inc. → Martin Mine; 2013-12-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wienerberger AG → General Shale Brick, Inc.; 2013-12-09 to current/open; source msha-controller-operator-history