# Relationship history for MSHA mine 4407328

Current hierarchy: **Henry  Layden → BAY SAND COMPANY, INC. → MUDDY CROSS 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:** Henry  Layden → MUDDY CROSS PIT; 1994-01-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** BAY SAND COMPANY, INC. → MUDDY CROSS PIT; 2014-11-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Henry  Layden → BAY SAND COMPANY, INC.; 2014-11-03 to current/open; source msha-controller-operator-history