# Relationship history for MSHA mine 4702527

Current hierarchy: **Linda  Gyr; Joel  Newhouse → L & H Gyr Excavating Inc → Gyr 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

- **operator_operates_mine:** L & H Gyr Excavating Inc → Gyr Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gyr Leonard & Hans → Gyr Pit; 1950-01-01 to 2016-04-19; source msha-controller-operator-history
- **controller_controls_operator:** Gyr Leonard & Hans → L & H Gyr Excavating Inc; 1950-01-01 to 2016-04-19; source msha-controller-operator-history
- **controller_controls_mine:** Joel  Newhouse et al → Gyr Pit; 2016-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joel  Newhouse et al → L & H Gyr Excavating Inc; 2016-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Linda  Gyr et al → L & H Gyr Excavating Inc; 2016-04-20 to current/open; source msha-controller-operator-history