# Relationship history for MSHA mine 1300349

Current hierarchy: **Sherwood  Patek; Bill  Forsythe → Midland Brick Company → Midland Brick Company**

- 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:** Can-Tex Industries → Midland Brick Company; 1950-01-01 to 1982-12-13; source msha-controller-operator-history
- **controller_controls_mine:** Harsco Corp → Midland Brick Company; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harsco Corp → Can-Tex Industries; 1950-01-01 to 1982-12-13; source msha-controller-operator-history
- **operator_operates_mine:** Midland Brick Company → Midland Brick Company; 1982-12-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sherwood  Patek  et al → Midland Brick Company; 1982-12-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sherwood  Patek  et al → Midland Brick Company; 1982-12-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Forsythe  et al → Midland Brick Company; 1982-12-14 to current/open; source msha-controller-operator-history