# Relationship history for MSHA mine 1700496

Current hierarchy: **Dana  Mc Quade; Ross  Mc Quade → A E Mc Quade & Sons Inc → MCQUADE PIT AND MILL**

- 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:** A E Mc Quade & Sons Inc → MCQUADE PIT AND MILL; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ross  Mc Quade  et al → MCQUADE PIT AND MILL; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ross  Mc Quade  et al → A E Mc Quade & Sons Inc; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dana  Mc Quade  et al → A E Mc Quade & Sons Inc; 1979-01-01 to current/open; source msha-controller-operator-history