# Relationship history for MSHA mine 1700333

Current hierarchy: **Thomas C Sturgeon → Harry C Crooker & Sons Inc → Durham Pit**

- 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:** Franklin T  Crooker → Durham Pit; 1950-01-01 to 2014-12-08; source msha-controller-operator-history
- **operator_operates_mine:** Durham Paving Company → Durham Pit; 1950-01-01 to 1988-03-22; source msha-controller-operator-history
- **controller_controls_mine:** Andrews Robert C → Durham Pit; 1950-01-01 to 1988-03-22; source msha-controller-operator-history
- **controller_controls_operator:** Andrews Robert C → Durham Paving Company; 1950-01-01 to 1988-03-22; source msha-controller-operator-history
- **operator_operates_mine:** Harry C Crooker & Sons Inc → Durham Pit; 1988-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Franklin T  Crooker → Harry C Crooker & Sons Inc; 1988-03-23 to 2014-12-08; source msha-controller-operator-history
- **controller_controls_mine:** Thomas C Sturgeon → Durham Pit; 2014-12-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas C Sturgeon → Harry C Crooker & Sons Inc; 2014-12-09 to current/open; source msha-controller-operator-history