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2. Glassine - Wikipedia

   en.wikipedia.org/wiki/Glassine

   Glassine. Printed glassine envelope for the photographer Arthur Weston, c. 1900. Glassine envelope. Glassine is a smooth and glossy paper that is air-, water-, and grease-resistant. It is usually available in densities between 50–90 g/m 2 (0.010–0.018 lb/sq ft). It is translucent unless dyes are added to color it or make it opaque.

3. Envelope - Wikipedia

   en.wikipedia.org/wiki/Envelope

   An envelope is a common packaging item, usually made of thin, flat material. It is designed to contain a flat object, such as a letter or card . Traditional envelopes are made from sheets of paper cut to one of three shapes: a rhombus, a short-arm cross or a kite. These shapes allow the envelope structure to be made by folding the sheet sides ...

4. Airship - Wikipedia

   en.wikipedia.org/wiki/Airship

   The envelope is the normal cigar shape, complete with tail fins, but is inflated with hot air instead of helium to provide the lifting force. A small gondola, carrying the pilot and passengers, a small engine, and the burners to provide the hot air are suspended below the envelope, beneath an opening through which the burners protrude.

5. Kraft paper - Wikipedia

   en.wikipedia.org/wiki/Kraft_paper

   Kraft paper. Kraft paper or kraft[ 1] is paper or paperboard (cardboard) produced from chemical pulp produced in the kraft process . Sack kraft paper (or just sack paper) is a porous kraft paper with high elasticity and high tear resistance, designed for packaging products with high demands for strength and durability. [ 2]

6. Completion (oil and gas wells) - Wikipedia

   en.wikipedia.org/wiki/Completion_(oil_and_gas_wells)

   Completion (oil and gas wells) Well completion is the process of making a well ready for production (or injection) after drilling operations. This principally involves preparing the bottom of the hole to the required specifications, running in the production tubing and its associated down hole tools as well as perforating and stimulating as ...

7. Airmail - Wikipedia

   en.wikipedia.org/wiki/Airmail

   Airmail. Airmail instructional mark on a parcel from Kyrgyzstan. 1912 German airmail between Bork and Brück. A cover carried on a 1932 first flight in the north woods of Canada, with a cachet and franked with both a regular and an airmail stamp. Airmail (or air mail) is a mail transport service branded and sold on the basis of at least one leg ...