Siemens Model 90 In-the-Ear (ITE) Hearing Aids The Siemens Model 90 in-the-ear (ITE) hearing aids were manufactured by Siemens A. G. of Germany around 1990. These small aids are known as half shell aids because they only fill half the bowl of the outer ear. |  | Click picture for larger view | | |  | | | |
| Back view of a Siemens Model 90 in-the-ear hearing aid showing the microphone port (lower left), the battery door (center), adjustment screw—probably for tone (upper right) and volume control (lower right). Opening the battery door acted as the on-off switch. |  | Click picture for larger view | | | |
| View of a Siemens Model 90 in-the-ear hearing aid showing the battery door opened and a No. 312 (brown tab) battery in place.
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| Front view of the Siemens Model 90 in-the-ear hearing aid showing the vent hole (left) and the opening for the sound (right).
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| Back view of the Siemens Model 90 in-the-ear hearing aid showing the outside end of the vent hole (lower right).
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| Close-up of the right Siemens Model 90 in-the-ear hearing aid. The red bar (upper center) indicates it is the right aid. The model number and serial number are directly below the red bar.
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| Close-up of the left Siemens Model 90 in-the-ear hearing aid. The blue bar (center) indicates it is the left aid. The model number and serial number are directly above the blue bar. Note that this is a matched pair. The serial numbers are sequential. The left hearing aid's serial number is one more than the right one.
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| View of the Siemens Model 90 in-the-ear hearing aids and their soft vinyl case. The cleaning/ear-wax removal tool is shown below the case.
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| View of the Siemens Model 90 in-the-ear hearing aid showing its size. (The ruler increments are in 1/16".)
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