Fire-fighting equipment, namely, fluid collector manufactured and/or adapted to be affixed to aircraft for fighting fires from the air, mechanical fluid-spreader manufactured and/or adapted to be affixed to aircraft for fighting fires from the air, gravity fluid-spreader manufactured and/or adapted to be affixed to aircraft for fighting fires from the air, mechanical foam-spreader manufactured and/or adapted to be affixed to aircraft for fighting fires from the air, and gravity foam-spreader manufactured and/or adapted to be affixed to aircraft for fighting fires from the air; Agricultural equipment, namely, fluid or dry material collector manufactured and/or adapted to be affixed to aircraft for applying fluid or dry material to seeds and plants as a fertilizer, herbicide, fungicide and/or pesticide, mechanical fluid or dry-material spreader manufactured and/or adapted to be affixed to aircraft for applying fluid or dry material to seeds and plants as a fertilizer, herbicide, fungicide and/or pesticide, gravity fluid or dry-material spreader manufactured and/or adapted to be affixed to aircraft for applying fluid or dry material to seeds and plants as a fertilizer, herbicide, fungicide and/or pesticide, mechanical spreader manufactured and/or adapted to be affixed to aircraft for applying fertilizer, herbicides, fungicides, and/or pesticides, and gravity spreader manufactured and/or adapted to be affixed to aircraft for applying fertilizer, herbicides, fungicides, and/or pesticides; and cleaning equipment, namely, mechanical sprayer manufactured and/or adapted to be affixed to aircraft for applying materials to clean power generation equipment and structures, windmills, power storage equipment and structures and power transmission equipment and structures, and mechanical sprayer manufactured and/or adapted to be affixed to aircraft for cleaning ice and snow from power generation equipment and structures, windmills, power storage equipment and structures and power transmission equipment and structures; Insect and pest control equipment, namely, mechanical spreader manufactured and/or adapted to be affixed to aircraft for applying pest-control materials and insect-control materials, and gravity spreader manufactured and/or adapted to be affixed to aircraft for applying pest-control materials and insect-control materials