"We are probably nearing the limit of all we can know about astronomy."
Simon Newcomb, astronomer ; 1888
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| Number | Title | Issue Date |
| 5413112 | Expiratory flow measuring device A device for measuring the maximum flow rate of a single forced expiration, comprises an elongated hollow body with inlet and outlet ends, a vane mounted to a shaft and rotatable within the body from a defined rest position, and an indicator to indicate m... | 05/09/1995 |