# Relationship history for MSHA mine 3200714

Current hierarchy: **Ryan Allen  Sherbrooke → Dicks Construction → Portable 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:** Dicks Construction → Portable Crusher; 1989-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dannie  Dick → Portable Crusher; 1989-09-01 to 2026-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Dannie  Dick → Dicks Construction; 1989-09-01 to 2026-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Ryan Allen  Sherbrooke → Portable Crusher; 2026-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ryan Allen  Sherbrooke → Dicks Construction; 2026-06-01 to current/open; source msha-controller-operator-history