# Relationship history for MSHA mine 2002484

Current hierarchy: **Timothy  Torpey → Central Michigan Sand and Gravel → Torpey Pit**

- 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:** Central Michigan Sand & Gravel → Torpey Pit; 1979-01-01 to 1985-07-04; source msha-controller-operator-history
- **controller_controls_mine:** Gray Duane → Torpey Pit; 1979-01-01 to 1985-07-04; source msha-controller-operator-history
- **controller_controls_operator:** Gray Duane → Central Michigan Sand & Gravel; 1979-01-01 to 1985-07-04; source msha-controller-operator-history
- **operator_operates_mine:** Central Michigan Sand & Gravel → Torpey Pit; 1985-07-05 to 2022-04-04; source msha-controller-operator-history
- **controller_controls_mine:** Torpey R G → Torpey Pit; 1985-07-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Torpey R G → Central Michigan Sand & Gravel; 1985-07-05 to 2022-04-04; source msha-controller-operator-history
- **operator_operates_mine:** Central Michigan Sand and Gravel → Torpey Pit; 2022-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Timothy  Torpey → Torpey Pit; 2022-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Timothy  Torpey → Central Michigan Sand and Gravel; 2022-04-05 to current/open; source msha-controller-operator-history