v2478-695

THAT PLUNGERS AND LET VERS ARE Eau/VALENT5

TOR MOVING TARPET3 WAS KNOWN /N /8&3

From Kettell's Fig. 1 (below)

Moving tappets by means of

plungers with guides, is the

equivalent of moving tappets

by means of levers with pivots.

This substitution was usetl by

Kettell in 1883. See figures

at left.

In substituting the plunger at the

left for the lever shown below, the

infringer merely substituted a well

known mechanical equivalent, as

shown by Kettell

Infringement is not averted there-

by. See 78 U. S. 516, 20 L. Ed. S3.

fz-o/rt Re /s sue Patenf /Vo. Re. 20,82.7

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