# Relationship history for MSHA mine 4607910

Current hierarchy: **William E  Konya; Steve A  Konya → Miami Coal Company → #16 Mine**

- 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:** Steve A  Konya et al → #16 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Miami Coal Company → #16 Mine; 1990-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve A  Konya et al → Miami Coal Company; 1990-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William E  Konya et al → Miami Coal Company; 1990-07-01 to current/open; source msha-controller-operator-history