# Relationship history for MSHA mine 0801115

Current hierarchy: **Henry A  Fischer → Henry Fischer & Sons Inc → YELLOW SAND 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 A  Fischer → YELLOW SAND PIT; 1984-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Henry Fischer & Sons Inc → YELLOW SAND PIT; 1988-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Henry A  Fischer → Henry Fischer & Sons Inc; 1988-11-01 to current/open; source msha-controller-operator-history