When an adjacent Interceptor is triggered, the Retainer will remember the request that triggered it. It can only hold one request at a time and doesn't accept another until the last one is fulfilled.
When the Retainer receives a Redstone signal, it will cause the original requestor to resend the request.
A Redstone Comparator attached to the Retainer will emit a signal strength of 15 when it has a stored request.
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