In practice, the examiner only requests a working model in extreme cases where an invention defies fundamental laws of science and
inoperativeness is incredibly clear.
The interaction between a consonant and a vowel is incontrovertible evidence for the
inoperativeness of the similarity principle.
('All we can do is guess whether or not there will be floods in the area depending on the strength of rains that hit them.') Of even greater concern was the
inoperativeness of half the ten radar stations used in the location and tracking of tropical storms and that only two of the four radiosondes used for measuring humidity at different levels of the atmosphere had the necessary balloons to permit them to carry out this function.
