At1-9(1) -

Which field or subject are we looking at?

It might refer to a specific clause in an aviation, mechanical, or electrical manual.

In many city codes, this refers to a specific type of "Apartment" or "Residential" zoning sub-district (often regarding density or height limits).

At1-9(1) -

Which field or subject are we looking at?

It might refer to a specific clause in an aviation, mechanical, or electrical manual.

In many city codes, this refers to a specific type of "Apartment" or "Residential" zoning sub-district (often regarding density or height limits).

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