# Relationship history for MSHA mine 0405056

Current hierarchy: **Karen J  Hay; William G  Hay → Bed Rock Inc → BED ROCK, INC.**

- 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:** Bed Rock Inc → BED ROCK, INC.; 1989-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William G  Hay  et al → BED ROCK, INC.; 1989-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William G  Hay  et al → Bed Rock Inc; 1989-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Karen J  Hay  et al → Bed Rock Inc; 1989-10-01 to current/open; source msha-controller-operator-history