Freeze/thaw indicator

Frost line indicator

Fuel level indicator system

Gas economizer

Gas saving tactile device

Gauge for indicating available water supply

Gravity impact indicator for shipping containers

Grease level indicator

Hair dryer with alarm notifying user of clogged filter

Heat-sensitive odor-emitting component

Hot bearing alarm

House plant water content indicator

Incipient bearing failure indicator

Indexing apparatus for a record and/or playback device

Indicator flag construction

Inertial performance indicator

Interruptible time-temperature indicator

Intruder alarm

Irreversible warmup indicator

Irrigation signalling device