# Relationship history for MSHA mine 0503791

Current hierarchy: **Jerry Bud  Carpenter → Grand Gravel Pit LLC → CRUSHER**

- 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:** Linke Construction Inc → CRUSHER; 1982-08-01 to 2018-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Linke Richard A → CRUSHER; 1982-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Linke Richard A → Linke Construction Inc; 1982-08-01 to 2018-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Skylar  Carpenter et al → CRUSHER; 2017-06-14 to 2025-05-19; source msha-controller-operator-history
- **operator_operates_mine:** Grand Gravel Pit LLC → CRUSHER; 2018-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Skylar  Carpenter et al → Grand Gravel Pit LLC; 2018-04-30 to 2025-05-19; source msha-controller-operator-history
- **controller_controls_operator:** Bud  Carpenter et al → Grand Gravel Pit LLC; 2018-04-30 to 2025-05-19; source msha-controller-operator-history
- **controller_controls_mine:** Jerry Bud  Carpenter → CRUSHER; 2025-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry Bud  Carpenter → Grand Gravel Pit LLC; 2025-05-20 to current/open; source msha-controller-operator-history