# Relationship history for MSHA mine 2302148

Current hierarchy: **Shakespeare Oil Company Inc; T & T Oil Company Inc → Brenda Kay Sand LLC → Brenda Kay Sand LLC**

- 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

- **operator_operates_mine:** Brenda Kay Contruction  Inc. → Brenda Kay Sand LLC; 1996-12-01 to 2005-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Brenda Kay  Dumey → Brenda Kay Sand LLC; 1996-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brenda Kay  Dumey → Brenda Kay Contruction  Inc.; 1996-12-01 to 2005-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Brenda Kay Sand LLC → Brenda Kay Sand LLC; 2005-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shakespeare Oil Company Inc et al → Brenda Kay Sand LLC; 2005-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shakespeare Oil Company Inc et al → Brenda Kay Sand LLC; 2005-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** T & T Oil Company Inc et al → Brenda Kay Sand LLC; 2005-03-01 to current/open; source msha-controller-operator-history