# Relationship history for MSHA mine 1100037

Current hierarchy: **T & T Oil Company Inc; Shakespeare Oil Company Inc → Shawnee Stone LLC → Ullin Plant**

- 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:** Columbia Quarry Company → Ullin Plant; 1950-01-01 to 2007-05-04; source msha-controller-operator-history
- **controller_controls_mine:** Clyde D  Trexler → Ullin Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clyde D  Trexler → Columbia Quarry Company; 1950-01-01 to 2007-05-04; source msha-controller-operator-history
- **operator_operates_mine:** Shawnee Stone LLC → Ullin Plant; 2007-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shakespeare Oil Company Inc et al → Ullin Plant; 2007-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shakespeare Oil Company Inc et al → Shawnee Stone LLC; 2007-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** T & T Oil Company Inc et al → Shawnee Stone LLC; 2007-05-05 to current/open; source msha-controller-operator-history