.~ With indicating, testing, measuring or locating {21}
250.11
.~.~ Holder for coupon or sensor
DEFINITION
Classification: 166/250.11
Holder for coupon or sensor:
(under subclass 250.01) Indicating including the step(s) of using or installing a device to retain (a) a metal member to monitor the effect of corrosion or (b) a detector within a well.