# Relationship history for MSHA mine 3606169

Current hierarchy: **Gary  Doverspike → Gary C Doverspike → Burkett Strip**

- 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:** Gary  Doverspike → Burkett Strip; 1974-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** L & L Burkett Coal Company → Burkett Strip; 1976-08-01 to 1980-03-19; source msha-controller-operator-history
- **controller_controls_mine:** Burkett Larry L & Leonard W → Burkett Strip; 1976-08-01 to 1980-03-19; source msha-controller-operator-history
- **controller_controls_operator:** Burkett Larry L & Leonard W → L & L Burkett Coal Company; 1976-08-01 to 1980-03-19; source msha-controller-operator-history
- **operator_operates_mine:** Gary C Doverspike → Burkett Strip; 1980-03-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Doverspike → Gary C Doverspike; 1980-03-20 to current/open; source msha-controller-operator-history