# Relationship history for MSHA mine 4101344

Current hierarchy: **Pedro E  Aguado → Cobra Stone Inc. → Cordova Quarry**

- 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:** Featherlite Building Products Corp → Cordova Quarry; 1950-01-01 to 2000-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Justin Industries Inc → Cordova Quarry; 1950-01-01 to 2001-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Justin Industries Inc → Featherlite Building Products Corp; 1950-01-01 to 2000-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Berkshire Hathaway Inc → Cordova Quarry; 2000-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Acme Building Brands → Cordova Quarry; 2000-08-01 to 2001-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Berkshire Hathaway Inc → Cordova Quarry; 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:** Featherlite Bldg Prod Corp → Cordova Quarry; 2002-01-01 to 2005-09-26; source msha-controller-operator-history
- **controller_controls_operator:** Justin Industries Inc → Featherlite Bldg Prod Corp; 2002-01-01 to 2001-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Berkshire Hathaway Inc → Cordova Quarry; 2002-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Berkshire Hathaway Inc → Featherlite Building Products Corp; 2002-01-01 to 2000-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Berkshire Hathaway Inc → Featherlite Bldg Prod Corp; 2002-01-01 to 2005-09-26; source msha-controller-operator-history
- **operator_operates_mine:** Acme Brick Company → Cordova Quarry; 2005-09-27 to 2023-11-16; source msha-controller-operator-history
- **controller_controls_operator:** Berkshire Hathaway Inc → Acme Brick Company; 2005-09-27 to 2023-11-16; source msha-controller-operator-history
- **controller_controls_mine:** Pedro E  Aguado → Cordova Quarry; 2006-04-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cobra Stone Inc. → Cordova Quarry; 2023-11-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pedro E  Aguado → Cobra Stone Inc.; 2023-11-17 to current/open; source msha-controller-operator-history