# Relationship history for MSHA mine 3608638

Current hierarchy: **John  Heeman Jr → Heeman Quarries → CLAPPER 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:** John  Heeman Jr → CLAPPER PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Newhart Quarrys → CLAPPER PIT; 1997-04-01 to 1998-04-27; source msha-controller-operator-history
- **controller_controls_mine:** Dennis L Newhart → CLAPPER PIT; 1997-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis L Newhart → Newhart Quarrys; 1997-04-01 to 1998-04-27; source msha-controller-operator-history
- **operator_operates_mine:** Heeman Quarries → CLAPPER PIT; 1998-04-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Heeman Jr → Heeman Quarries; 1998-04-28 to current/open; source msha-controller-operator-history