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That belonging to something of greater importance. Contracts usually describe a main structure and add a catchall for all appurtenances.

• In real estate law, easements, or the right to use another's property, may be appurtenant or in gross.

• If appurtenant, then the easement belongs to what is called the dominant estate (property) and passes to new owners for all time until the easement is abandoned. For example, an easement for ingress and egress over another's property is an easement appurtenant. The property that enjoys the easement is the dominant estate, and the property over which one may travel is called the servient estate. A sale of the dominant estate automatically includes a transfer of the easement, because it is appurtenant.

• Contrast with an easement in gross, which might be a right to park one's antique car at a friend's house and gain ingress and egress for purposes of using the car. This easement is personal and not tied to any particular real estate.

• This is a tricky area of the law that generally requires the assistance of a lawyer specializing in complex real estate issues. The seminal case on the subject is the 1850 English case of Ackroyd v. Smith.

The Complete Real Estate Encyclopedia by Denise L. Evans, JD & O. William Evans, JD. Copyright © 2007 by The McGraw-Hill Companies, Inc.
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It is a plithogenic hypersoft set, such that the degree of appurtenance of an element x to the set M, with respect to each attribute value, is crisp:
[d.sup.0.sub.x]([alpha]) = 0 (nonappurtenance), or 1 (appurtenance).
One explanation for the drop in noise level in the 63-Hz band at peak efficiency and free delivery could be that the overall length of the appurtenance, which measured 1.2-m (4-ft), corresponded to a 1/4 wavelength.
Normalizing for flow rate and pressure is not sufficient to non-dimentionalize the appurtenance acoustical effect and correlate the noise data between fans of different dimensions.
The data reduction approach first required measurement of aerodynamic performance of a baseline case (with no inlet appurtenance) followed by measurements when various appurtenances were situated at the inlet plane of the fans.
The 914-mm (36-in) diameter fan appurtenance sound levels show a drop in the 160-Hz band which is likely due to an electrical grounding problem with the baseline case and provided on average a 13 dB reduction in that band.
Little information exists for accurately predicting the aerodynamic and acoustical response of small propeller fans to common appurtenances at the fan inlet, which are referred to as system effects.
The measured sound power levels with appurtenances were compared to the sound power level of the baseline case at peak efficiency and free delivery for both the 100% and 70% cases.
Figures 3 through 10 portray the effect of the appurtenances for the 610-mm (24-in) and 914-mm (36-in) diameter fans by subtracting the baseline sound levels from the sound levels measured with obstructions placed near the entrance plane of the fan.