# Relationship history for MSHA mine 4201948

Current hierarchy: **Holmes John → John Holmes → Holmes 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:** Holmes & Sons Inc → Holmes Crusher; 1985-07-01 to 1987-01-28; source msha-controller-operator-history
- **controller_controls_mine:** Don  Holmes → Holmes Crusher; 1985-07-01 to 1987-01-28; source msha-controller-operator-history
- **controller_controls_operator:** Don  Holmes → Holmes & Sons Inc; 1985-07-01 to 1987-01-28; source msha-controller-operator-history
- **operator_operates_mine:** John Holmes → Holmes Crusher; 1987-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Holmes John → Holmes Crusher; 1987-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holmes John → John Holmes; 1987-01-29 to current/open; source msha-controller-operator-history