Any number of persons doing business in copartnership at any one place shall be required to pay but one special tax.

The payment of the special tax imposed, other than the tax imposed by section 4411, shall not exempt from an additional special tax the person carrying on a trade or business in any other place than that stated in the register kept in the office of the official in charge of the internal revenue district; but nothing herein contained shall require a special tax for the storage of goods, wares, or merchandise in other places than the place of business, nor, except as provided in this subtitle, for the sale by manufacturers or producers of their own goods, wares, and merchandise, at the place of production or manufacture, and at their principal office or place of business, provided no goods, wares, or merchandise shall be kept except as samples at said office or place of business.

Whenever more than one of the pursuits or occupations described in this subtitle are carried on in the same place by the same person at the same time, except as otherwise provided in this subtitle, the tax shall be paid for each according to the rates severally prescribed.

The payment of any special tax imposed by this subtitle for carrying on any trade or business shall not be held to exempt any person from any penalty or punishment provided by the laws of any State for carrying on the same within such State, or in any manner to authorize the commencement or continuance of such trade or business contrary to the laws of such State or in places prohibited by municipal law; nor shall the payment of any such tax be held to prohibit any State from placing a duty or tax on the same trade or business, for State or other purposes.

Any special tax imposed by this subtitle, except the tax imposed by section 4411, shall apply to any agency or instrumentality of the United States unless such agency or instrumentality is granted by statute a specific exemption from such tax.