# Relationship history for MSHA mine 4100305

Current hierarchy: **Berkshire Hathaway Inc → Acme Brick Company → AWC JEN RSP  DANIELS HLP THTN**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Justin Industries Inc → AWC JEN RSP  DANIELS HLP THTN; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Texas Clay Industries Inc → AWC JEN RSP  DANIELS HLP THTN; 1950-01-01 to 1999-01-31; source msha-controller-operator-history
- **controller_controls_mine:** M D  Ward → AWC JEN RSP  DANIELS HLP THTN; 1950-01-01 to 1999-01-31; source msha-controller-operator-history
- **controller_controls_operator:** M D  Ward → Texas Clay Industries Inc; 1950-01-01 to 1999-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Acme Brick Company → AWC JEN RSP  DANIELS HLP THTN; 1999-02-01 to 2000-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Justin Industries Inc → Acme Brick Company; 1999-02-01 to 2000-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Berkshire Hathaway Inc → AWC JEN RSP  DANIELS HLP THTN; 2000-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Acme Building Brands → AWC JEN RSP  DANIELS HLP THTN; 2000-08-01 to 2001-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Berkshire Hathaway Inc → AWC JEN RSP  DANIELS HLP THTN; 2000-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Berkshire Hathaway Inc → Acme Building Brands; 2000-08-01 to 2001-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Acme Brick Company → AWC JEN RSP  DANIELS HLP THTN; 2002-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Berkshire Hathaway Inc → Acme Brick Company; 2002-01-01 to current/open; source msha-controller-operator-history