# Relationship history for MSHA mine 3400687

Current hierarchy: **Arthur G  Hatfield → H&H Sand and Gravel LLC → Cobb Land Trust**

- 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:** R R Behne Sand & Gravel → Cobb Land Trust; 1950-01-01 to 1994-01-03; source msha-controller-operator-history
- **controller_controls_mine:** Robert R  Behne → Cobb Land Trust; 1950-01-01 to 1994-01-03; source msha-controller-operator-history
- **controller_controls_operator:** Robert R  Behne → R R Behne Sand & Gravel; 1950-01-01 to 1994-01-03; source msha-controller-operator-history
- **operator_operates_mine:** Behne Construction Company Inc → Cobb Land Trust; 1994-01-04 to 2014-03-18; source msha-controller-operator-history
- **controller_controls_mine:** Ted R  Behne → Cobb Land Trust; 1994-01-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ted R  Behne → Behne Construction Company Inc; 1994-01-04 to 2014-03-18; source msha-controller-operator-history
- **operator_operates_mine:** Texas County Redi-Mix LLC → Cobb Land Trust; 2014-03-19 to 2021-10-27; source msha-controller-operator-history
- **controller_controls_mine:** Arthur G  Hatfield → Cobb Land Trust; 2014-03-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arthur G  Hatfield → Texas County Redi-Mix LLC; 2014-03-19 to 2021-10-27; source msha-controller-operator-history
- **operator_operates_mine:** H&H Sand and Gravel LLC → Cobb Land Trust; 2021-10-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Arthur G  Hatfield → Cobb Land Trust; 2021-10-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arthur G  Hatfield → H&H Sand and Gravel LLC; 2021-10-28 to current/open; source msha-controller-operator-history