11 vacuum cleaner manuals added

11 more vacuum manuals and parts lists were added recently:

- 3M: 1 vacuum cleaner parts list
- Bissell: 2 vacuum cleaner manuals
- Dyson: 4 vacuum cleaner manuals
- Hayward: 1 pool vacuum parts list
- Hoover: 1 vacuum cleaner manual
- Morphy Richards: 1 vacuum cleaner manual
- Oreck: 1 vacuum cleaner parts list

3M vacuum cleaner manuals

Operating instructions:
- 3M 497 (AB) International Service / 497 (ABF) Electronic Service Vacuum
- 3M 497ABF International Service Vacuum
- 3M 497AJM / 497ABF Service and Electronic Vacuum

Features & replacement parts lists:
- 3M 497AJM 120-Volt / 497ABF 220-Volt Electronics Vacuum