# Relationship history for MSHA mine 1102323

Current hierarchy: **Shakespeare Oil Company Inc; T & T Oil Company Inc → Shawnee Sand & Gravel → Shawnee Sand & Gravel**

- 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:** Shakespeare Oil Company Inc et al → Shawnee Sand & Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Jackson County Sand & Gravel Co. Inc. → Shawnee Sand & Gravel; 1950-01-01 to 2008-12-23; source msha-controller-operator-history
- **controller_controls_mine:** S F  Brown → Shawnee Sand & Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** S F  Brown → Jackson County Sand & Gravel Co. Inc.; 1950-01-01 to 2008-12-23; source msha-controller-operator-history
- **operator_operates_mine:** Shawnee Sand & Gravel → Shawnee Sand & Gravel; 2008-12-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shakespeare Oil Company Inc et al → Shawnee Sand & Gravel; 2008-12-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** T & T Oil Company Inc et al → Shawnee Sand & Gravel; 2008-12-24 to current/open; source msha-controller-operator-history