# Relationship history for MSHA mine 4801695

Current hierarchy: **Mark D  Hettinger → Hettinger Welding LLC → CEC Crusher #2**

- 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:** Mark D  Hettinger et al → CEC Crusher #2; 2003-05-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hettinger Welding, Inc. → CEC Crusher #2; 2006-04-20 to 2007-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Mark D  Hettinger et al → Hettinger Welding, Inc.; 2006-04-20 to 2007-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Hettinger Welding LLC → CEC Crusher #2; 2008-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mark D  Hettinger et al → CEC Crusher #2; 2008-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark D  Hettinger et al → Hettinger Welding LLC; 2008-01-01 to current/open; source msha-controller-operator-history