# Relationship history for MSHA mine 3304728

Current hierarchy: **W Thomas  Mackall → EAST FAIRFIELD COAL CO., LIMESTONE DIVISION → HONEY CREEK 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** W Thomas  Mackall et al → HONEY CREEK PIT; 1996-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** East Fairfield Coal Co. → HONEY CREEK PIT; 2016-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** W Thomas  Mackall et al → East Fairfield Coal Co.; 2016-08-31 to current/open; source msha-controller-operator-history