# Relationship history for MSHA mine 0202748

Current hierarchy: **Jason  Haines → HOWARD GRAY STONE → MILLION $ BUFF GRINDSTONE CANYON**

- 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:** Howard Gray Stone → MILLION $ BUFF GRINDSTONE CANYON; 1997-12-01 to 2009-04-09; source msha-controller-operator-history
- **controller_controls_mine:** Marie I  Gray → MILLION $ BUFF GRINDSTONE CANYON; 1997-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marie I  Gray → Howard Gray Stone; 1997-12-01 to 2009-04-09; source msha-controller-operator-history
- **operator_operates_mine:** Howard Gray Stone → MILLION $ BUFF GRINDSTONE CANYON; 2009-04-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jason  Haines → MILLION $ BUFF GRINDSTONE CANYON; 2009-04-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jason  Haines → Howard Gray Stone; 2009-04-10 to current/open; source msha-controller-operator-history