# Relationship history for MSHA mine 4801134

Current hierarchy: **James M  Frost → Frost Construction Company → Cross H Mesa D 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:** Big Horn Construction → Cross H Mesa D Pit; 1950-01-01 to 1979-02-25; source msha-controller-operator-history
- **controller_controls_mine:** Peter Kiewit Sons' Inc → Cross H Mesa D Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peter Kiewit Sons' Inc → Big Horn Construction; 1950-01-01 to 1979-02-25; source msha-controller-operator-history
- **controller_controls_mine:** Richard  Gilpatrick → Cross H Mesa D Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James M  Frost → Cross H Mesa D Pit; 1978-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gilpatrick Construction Company Inc → Cross H Mesa D Pit; 1979-02-26 to 1980-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Gilpatrick → Gilpatrick Construction Company Inc; 1979-02-26 to 1980-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Frost Construction Company → Cross H Mesa D Pit; 1980-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James M  Frost → Frost Construction Company; 1980-02-01 to current/open; source msha-controller-operator-history