# Relationship history for MSHA mine 2300584

Current hierarchy: **Evelyn G  Trickel → Trenton Sand Company Inc → TRENTON SAND CO**

- 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:** Thompson Weldon Sand Inc → TRENTON SAND CO; 1950-01-01 to 1983-04-21; source msha-controller-operator-history
- **controller_controls_mine:** E E  Trenary → TRENTON SAND CO; 1950-01-01 to 1983-04-21; source msha-controller-operator-history
- **controller_controls_operator:** E E  Trenary → Thompson Weldon Sand Inc; 1950-01-01 to 1983-04-21; source msha-controller-operator-history
- **operator_operates_mine:** Trenton Sand Company → TRENTON SAND CO; 1983-04-22 to 1995-03-07; source msha-controller-operator-history
- **controller_controls_mine:** Wendell  Guess → TRENTON SAND CO; 1983-04-22 to 1995-03-07; source msha-controller-operator-history
- **controller_controls_operator:** Wendell  Guess → Trenton Sand Company; 1983-04-22 to 1995-03-07; source msha-controller-operator-history
- **operator_operates_mine:** Trenton Sand Company Inc → TRENTON SAND CO; 1995-03-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Evelyn G  Trickel → TRENTON SAND CO; 1995-03-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Evelyn G  Trickel → Trenton Sand Company Inc; 1995-03-08 to current/open; source msha-controller-operator-history