# Relationship history for MSHA mine 0503676

Current hierarchy: **Curtis Guy G-Michael G Gimple → Ramah Mines Company → Harper Placer**

- 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

- **controller_controls_mine:** Curtis Guy G-Michael G Gimple → Harper Placer; 1981-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ramah Mines Company → Harper Placer; 1981-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Curtis Guy G-Michael G Gimple → Ramah Mines Company; 1981-05-01 to current/open; source msha-controller-operator-history