# Relationship history for MSHA mine 4103537

Current hierarchy: **Cheryl A Alrecht; Jim  Fentress → H J G Trucking Inc → H J G Trucking Sand 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** H J G Trucking Inc → H J G Trucking Sand Pit; 1988-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sharon  Fentress → H J G Trucking Sand Pit; 1988-08-01 to 2016-08-26; source msha-controller-operator-history
- **controller_controls_operator:** Sharon  Fentress → H J G Trucking Inc; 1988-08-01 to 2016-08-26; source msha-controller-operator-history
- **controller_controls_mine:** Cheryl A Alrecht et al → H J G Trucking Sand Pit; 2016-08-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cheryl A Alrecht et al → H J G Trucking Inc; 2016-08-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jim  Fentress et al → H J G Trucking Inc; 2016-08-27 to current/open; source msha-controller-operator-history