# Relationship history for MSHA mine 3608259

Current hierarchy: **Perry Bros Coal Co - Gulf Resources & Chemical Cor → Perry - C & K Mining Venture → Bros 3**

- 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:** Perry - C & K Mining Venture → Bros 3; 1991-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Perry Bros Coal Co - Gulf Resources & Chemical Cor → Bros 3; 1991-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Perry Bros Coal Co - Gulf Resources & Chemical Cor → Perry - C & K Mining Venture; 1991-04-01 to current/open; source msha-controller-operator-history